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2014 
GaussStones: 
Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays 
Rong-Hao Liang1,2, Han-...
Multi-Token Interactions
Multi-Token Interactions
Multi-Token Interactions
Multi-Token Interactions on Interactive Tabletops 
Sculpting and Simulation Boardgaming Live Music Performance 
SandScape ...
Multi-Token Sensing Techniques 
EMR-Tag Sensing LC-Tag Sensing Active IR-Tag Sensing 
SenseTable [Patten et. al. 2001] PIC...
Multi-Token Sensing Techniques 
EMR-Tag Sensing LC-Tag Sensing Active IR-Tag Sensing 
SenseTable [Patten et. al. 2001] PIC...
Multi-Token Interactions on Portable Displays 
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/HQJWK)RUVRPHHOHPHQWVDORQJHUUHSUHVHQWDWLRQFDQEH 
XV...
Multi-Token Interactions on Portable Displays 
RSWLRQVLQDVHWWLQJVILOH 
/HQJWK)RUVRPHHOHPHQWVDORQJHUUHSUHVHQWDWLRQFDQEH 
XV...
GaussSense 
[Liang et. al. UIST 2012]
c d 
magnet 
GaussSense 
[Liang et. al. UIST 2012]
c d 
magnet 
GaussBits 
[Liang et. al. CHI 2013] 
GaussSense
GaussBits 
[Liang et. al. CHI 2013] 
GaussSense
Problem: 
Radial Magnetic Field of Each Discrete Tokens 
Interferes with Others in Multi-Token Interactions
Organic Form Construction 
GaussBricks 
[Liang et. al. CHI 2014] 
GaussBits 
GaussSense
Multi-Token Interactions Using Discrete Tokens 
GaussStones 
Shielded Magnetic Tangibles 
GaussBricks 
GaussBits 
GaussSen...
Solution: 
Magnetic Shielding 
magnetic shield 
magnet
UNDERSTANDING 
Magnetic Shielding
FACT: Electromagnetic (EM) Wave Shielding 
is ineffective to block static magnetic fields 
FACT: Electromagnetic (EM) Wave...
FACT: Electromagnetic (EM) Wave Shielding 
is ineffective to block static magnetic fields 
FACT: EM-Wave Shielding (a.k.a....
FACT: EM-Wave Shielding 
is ineffective to block static magnetic fields 
EM-Wave Static field 
conductive material conduct...
High-permeability materials 
block static magnetic fields by redirecting them 
EM-Wave Static field 
(e(.eg.g. .g gaallvva...
High-permeability High-permeability materials materials 
(e.g. galvanized steel) 
block static magnetic fields by redirect...
High-permeability High-permeability materials materials 
(e.g. galvanized steel) 
block static magnetic fields by redirect...
High-permeability High-permeability materials materials 
(e.g. galvanized steel) 
block static magnetic fields by redirect...
Challenge: 
Design Challenge:! 
Designing Effective Magnetic Shielding that 
Designing Effective Magnetic Shielding that c...
Explorative Study 
Finding design 
parameters 
galvanized steel chip 
10mm(T) x 5mm(R) 
neodymium magnet 
Measurement #1: ...
Explorative Study 
Finding design 
parameters 
galvanized steel chip 
10mm(T) x 5mm(R) 
neodymium magnet 
Measurement #1: ...
Explorative Study 
Finding design 
parameters 
galvanized steel chip 
10mm(T) x 5mm(R) 
neodymium magnet 
iso-intensity co...
Explorative Study 
Finding design 
parameters 
galvanized steel chip 
10mm(T) x 5mm(R) 
neodymium magnet 
iso-intensity co...
iso-intensity contours (for every 10 gauss) 
Measurement #1: Interference Strength Measurement #2: Signal Strength 
1000 s...
Area-Intensity Profile 
Measurement #1: Interference Strength Measurement #2: Signal Strength 
Measurement #1: Interferenc...
No Bottom Sides Sides Sides Sides Sides Sides Sides 
15 15 15 9 12 15 15 15 15 
2 2 2 2 2 1.2 3 2 2 
0 0 0 0 0 0 0 2.5 5 
...
galvanized 
steel shield 
neodymium 
magnet 
Findings: 
Basic Design: 
Fix magnet at the center bottom 
with shielding on ...
Findings: 
Basic Design: 
Fix magnet at the center bottom 
with shielding on the sides to 
minimize the Interference and 
...
Findings: 
Results 2/4: Gap Distances (mm) 
Basic Design: 
Fix magnet at the center bottom 
with shielding on the sides to...
DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess 
Particles Tokens Knobs
DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess 
Particles Tokens Knobs 
Tokens without ...
Particles (7.8mm-radius, 6g) Shield: 2mm-thick 
Magnet: 2mm-radius
DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess 
Particles Tokens Knobs 
Tokens without ...
ID amount: 2 
N 
S
Using Larger Particles as Tokens 
ID amount = 2 ID amount = 4 ID amount = 6x2 = 12 
8.6 
1.2 
2 1.5 1.5 2 
N S 
12.5 15 
2...
Using Larger Particles as Tokens 
Using Larger Particles as Tokens 
ID amount = 2 ID amount = 4 ID amount = 6x2 = 12 
ID a...
Using Larger Particles as Tokens 
Using Larger Particles as Tokens 
ID amount = 2 ID amount = 4 ID amount = 6x2 = 12 
ID a...
DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess 
Particles Tokens Knobs 
Multi-core Toke...
Knobs - Multi-Core Tokens 
1.2 
2 1.5 1.5 2 
Provide additional IDs and Orientation Information 
N S 
2 
1.5 2 2.5 3 3.5 2...
Knobs - Multi-Core GaussStones 
Provide additional IDs and Orientation Information 
north 
south 
Dual-Core Tri-Core Quad-...
Knobs - Multi-Core Tokens 
Provide additional IDs and Orientation Information 
north 
south 
Dual-Core Tri-Core Quad-Core ...
1.5 2 2.5 3 3.5 2 x 2 
north 
south 
Dual-Core Tri-Core Quad-Core 
B0 B3 
B1 B2 
Registration 
2.16R 2.41R 
2R 
B0 B1 
B0 ...
ID amount of a k-core knob grows exponentially 
ID amount of a k-core knob grows exponentially 
with the core number and t...
Possible Generalizations 
2. Multi-Part Widgets with ID 
1. Stackable Tokens
Stackable Token 
(Particles with 2 IDs)
Stackable Token 
(Particles with 2 IDs)
Multi-Part Slider 
ID part 
Movable part 
Multi-Part Widgets 
(with IDs)
ID part 
movable part 
(Conductive) 
Multi-Part Widgets 
(with IDs)
Conclusion 
Interference-Free  Identifiable Shielded Magnetic Tangibles 
for Multi-Token Interactions on Portable Displays...
Discrete Tokens 
Multi-Token Interactions 
GaussStones 
Shielded 
Magnetic Tangibles 
Organic Form 
Constructive Interacti...
Project Gauss 
A system of Hardware, Materials, and Interaction Techniques 
that Turn Portable Displays into Generic TUI D...
ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays
ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays
ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays
ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays
ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays
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ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays

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GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays

This work presents GaussStones, a system of shielded magnetic tangibles design for supporting multi-token interactions on portable displays. Unlike prior works in sensing magnetic tangibles on portable displays, the proposed tangible design applies magnetic shielding by using an inexpensive galvanized steel case, which eliminates interference between magnetic tangibles. An analog Hall-sensor grid can recognize the identity of each shielded magnetic unit since each unit generates a magnetic field with a specific intensity distribution and/or polarization. Combining multiple units as a knob further allows for resolving additional identities and their orientations. Enabling these features improves support for applications involving multiple tokens. Thus, using prevalent portable displays provides generic platforms for tangible interaction design.

Project Page of GaussStones:
http://www.cmlab.csie.ntu.edu.tw/~howieliang/GaussStones.html

Published in: Technology

ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays

  1. 1. 2014 GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays Rong-Hao Liang1,2, Han-Chih Kuo1, Liwei Chan1, De-Nian Yang2, Bing-Yu Chen1 1National Taiwan University and 2Academia Sinica
  2. 2. Multi-Token Interactions
  3. 3. Multi-Token Interactions
  4. 4. Multi-Token Interactions
  5. 5. Multi-Token Interactions on Interactive Tabletops Sculpting and Simulation Boardgaming Live Music Performance SandScape [Wang et. al. 2010] Lumino [Baudisch et. al. 2010] ReacTable [Jorda et. al. 2007]
  6. 6. Multi-Token Sensing Techniques EMR-Tag Sensing LC-Tag Sensing Active IR-Tag Sensing SenseTable [Patten et. al. 2001] PICO [Patten et. al. 2007] MightyTrace [Hofer et. al. 2008]
  7. 7. Multi-Token Sensing Techniques EMR-Tag Sensing LC-Tag Sensing Active IR-Tag Sensing SenseTable [Patten et. al. 2001] PICO [Patten et. al. 2007] MightyTrace [Hofer et. al. 2008] x x x
  8. 8. Multi-Token Interactions on Portable Displays RSWLRQVLQDVHWWLQJVILOH /HQJWK)RUVRPHHOHPHQWVDORQJHUUHSUHVHQWDWLRQFDQEH XVHIXOWRFRQYHLQJWKDWWKH REMHFWLV IXUWKHUDZD,QRXU VWHP RI DQ DUURZ EHFRPHV ORQJHU WKH IDUWKHU DZDDQREMHFWLV Camera(s) Capacitive Touchscreen Magnetometer Portico [Avrahami et. al. 2011] Capstones [Chan et. al. 2012] MagGetz [Hwang et. al. 2013] 8VLQJ SKVLFDO WRNHQV WR SOD 7LF 7DF 7RH RQ WKH JDPH LV VXSHUYLVHG E 3RUWLFR DQG DQ LOOHJDO PRYHVDUHIODJJHGDQGDXGLEO³EX]]HG´
  9. 9. Multi-Token Interactions on Portable Displays RSWLRQVLQDVHWWLQJVILOH /HQJWK)RUVRPHHOHPHQWVDORQJHUUHSUHVHQWDWLRQFDQEH XVHIXOWRFRQYHLQJWKDWWKH REMHFWLV IXUWKHUDZD,QRXU VWHP RI DQ DUURZ EHFRPHV ORQJHU WKH IDUWKHU DZDDQREMHFWLV Camera(s) Capacitive Touchscreen Magnetometer SandScape [Avrahami et. al. 2011] Capstones [Chan et. al. 2012] MagGetz [Hwang et. al. 2013] 8VLQJ SKVLFDO WRNHQV WR SOD 7LF 7DF 7RH RQ WKH JDPH LV VXSHUYLVHG E 3RUWLFR DQG DQ LOOHJDO Occlusion-Sensitive Large size Require Calibration PRYHVDUHIODJJHGDQGDXGLEO³EX]]HG´
  10. 10. GaussSense [Liang et. al. UIST 2012]
  11. 11. c d magnet GaussSense [Liang et. al. UIST 2012]
  12. 12. c d magnet GaussBits [Liang et. al. CHI 2013] GaussSense
  13. 13. GaussBits [Liang et. al. CHI 2013] GaussSense
  14. 14. Problem: Radial Magnetic Field of Each Discrete Tokens Interferes with Others in Multi-Token Interactions
  15. 15. Organic Form Construction GaussBricks [Liang et. al. CHI 2014] GaussBits GaussSense
  16. 16. Multi-Token Interactions Using Discrete Tokens GaussStones Shielded Magnetic Tangibles GaussBricks GaussBits GaussSense
  17. 17. Solution: Magnetic Shielding magnetic shield magnet
  18. 18. UNDERSTANDING Magnetic Shielding
  19. 19. FACT: Electromagnetic (EM) Wave Shielding is ineffective to block static magnetic fields FACT: Electromagnetic (EM) Wave Shielding is ineffective to block static magnetic fields conductive material conductive material Electromagnetic shielding inside mobile phone by Petteri Aimonen Electromagnetic shielding inside mobile phone by Petteri Aimonen
  20. 20. FACT: Electromagnetic (EM) Wave Shielding is ineffective to block static magnetic fields FACT: EM-Wave Shielding (a.k.a. Faraday Cage) is ineffective to block static magnetic fields provided by Eddy current conductive material Opposing Field EM-Wave
  21. 21. FACT: EM-Wave Shielding is ineffective to block static magnetic fields EM-Wave Static field conductive material conductive material
  22. 22. High-permeability materials block static magnetic fields by redirecting them EM-Wave Static field (e(.eg.g. .g gaallvvaanniziezde sdte eslt)eel) High-permeability material
  23. 23. High-permeability High-permeability materials materials (e.g. galvanized steel) block static magnetic fields by redirecting them EM-Wave Static field (e.g. galvanized steel)
  24. 24. High-permeability High-permeability materials materials (e.g. galvanized steel) block static magnetic fields by redirecting them galvanized steel case EM-Wave Static field (e.g. galvanized steel)
  25. 25. High-permeability High-permeability materials materials (e.g. galvanized steel) block static magnetic fields by redirecting them galvanized steel case EM-Wave Static field (e.g. galvanized steel) analog Hall-sensor grid
  26. 26. Challenge: Design Challenge:! Designing Effective Magnetic Shielding that Designing Effective Magnetic Shielding that can Minimize Interference and Maximize Signal Strength Minimize the Interference and Maximize the Signal Strength galvanized steel case analog Hall-sensor grid
  27. 27. Explorative Study Finding design parameters galvanized steel chip 10mm(T) x 5mm(R) neodymium magnet Measurement #1: Interference Strength Measurement #2: Signal Strength
  28. 28. Explorative Study Finding design parameters galvanized steel chip 10mm(T) x 5mm(R) neodymium magnet Measurement #1: Interference Strength Measurement #2: Signal Strength
  29. 29. Explorative Study Finding design parameters galvanized steel chip 10mm(T) x 5mm(R) neodymium magnet iso-intensity contours (for every 10 gauss) Measurement #1: Interference Strength Measurement #2: Signal Strength Measurement #1: Interference Strength Measurement #2: Signal Strength Measurement #1: Interference Strength Measurement #2: Signal Strength
  30. 30. Explorative Study Finding design parameters galvanized steel chip 10mm(T) x 5mm(R) neodymium magnet iso-intensity contours (for every 10 gauss) Measurement #1: Interference Strength Measurement #2: Signal Strength Measurement #1: Interference Strength Measurement #2: Signal Strength Measurement #1: Interference Strength Measurement #2: Signal Strength
  31. 31. iso-intensity contours (for every 10 gauss) Measurement #1: Interference Strength Measurement #2: Signal Strength 1000 samples
  32. 32. Area-Intensity Profile Measurement #1: Interference Strength Measurement #2: Signal Strength Measurement #1: Interference Strength Measurement #2: Signal Strength contour size N S S iso-intensity contours (for every 10 gauss) Blob size per layer Area-Intensity Profile intensity iso-intensity contours (for every 10 gauss) 1000 samples Measurement #1: Interference Strength Measurement #2: Signal Strength contour size intensity Blob size per layer Area-Intensity Profile 1000 samples
  33. 33. No Bottom Sides Sides Sides Sides Sides Sides Sides 15 15 15 9 12 15 15 15 15 2 2 2 2 2 1.2 3 2 2 0 0 0 0 0 0 0 2.5 5 shielding method token width (mm) Results 1/4: Shielding methods No Sides Bottom shield thickness (mm) magnet z-axis position (mm) Measurement #1: Interference Strength Measurement #2: Signal Strength Results 2/4: Gap Distances (mm) 2 3.5 5 Measurement #1: Interference Strength Measurement #2: Signal Strength Results 3/4: Shield Thickness (mm) 1.2 3 2 Measurement #1: Interference Strength Measurement #2: Signal Strength Results 4/4: Magnet Positions 5 2.5 0 Measurement #1: Interference Strength Measurement #2: Signal Strength
  34. 34. galvanized steel shield neodymium magnet Findings: Basic Design: Fix magnet at the center bottom with shielding on the sides to minimize the Interference and maximize the Signal Strength
  35. 35. Findings: Basic Design: Fix magnet at the center bottom with shielding on the sides to minimize the Interference and maximize the Signal Strength Shield Thickness: Thicker is better, but just-thick-enough is the best. 1.2mm-thick 3mm-thick
  36. 36. Findings: Results 2/4: Gap Distances (mm) Basic Design: Fix magnet at the center bottom with shielding on the sides to minimize the Interference and maximize the Signal Strength 0 100 Shield Thickness: Thicker is better, but just-thick-enough is the best. Token size: Larger token has larger ID space Acceptable signal strength for both shielding and sensing 2/4: Gap Distances (gauss) 9mm Measurement #1: Interference Strength Measurement 2 3.5 5 15mm Measurement #1: Interference Strength Measurement #2: Signal Strength 2 3.5 Results
  37. 37. DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess Particles Tokens Knobs
  38. 38. DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess Particles Tokens Knobs Tokens without ID (x,y)
  39. 39. Particles (7.8mm-radius, 6g) Shield: 2mm-thick Magnet: 2mm-radius
  40. 40. DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess Particles Tokens Knobs Tokens without ID Tokens with ID (x,y) (ID,x,y)
  41. 41. ID amount: 2 N S
  42. 42. Using Larger Particles as Tokens ID amount = 2 ID amount = 4 ID amount = 6x2 = 12 8.6 1.2 2 1.5 1.5 2 N S 12.5 15 2 1.5 2 2.5 3 3.5 2 x 2 S Token radius Shield thickness Magnet radius Polarity 7.8 2 2 N S Larger Particles Provide More IDs (Unit: mm)
  43. 43. Using Larger Particles as Tokens Using Larger Particles as Tokens ID amount = 2 ID amount = 4 ID amount = 6x2 = 12 ID amount = 4 ID amount = 6x2 = 12 8.6 1.2 2 1.5 1.5 2 N S 12.5 15 2 1.5 2 2.5 3 3.5 2 x 2 S Token radius Shield thickness Magnet radius Polarity 7.8 2 2 N S Larger Particles Provide More IDs (Unit: mm) 8.6 1.2 1.5 1.5 2 N S 12.5 15 2 1.5 2 2.5 3 3.5 2 x 2 S Area-Intensity Profiles
  44. 44. Using Larger Particles as Tokens Using Larger Particles as Tokens ID amount = 2 ID amount = 4 ID amount = 6x2 = 12 ID amount = 4 ID amount = 6x2 = 12 8.6 1.2 2 1.5 1.5 2 N S 12.5 15 2 1.5 2 2.5 3 3.5 2 x 2 S Token radius Shield thickness Magnet radius Polarity 7.8 2 2 N S Larger Particles Provide More IDs (Unit: mm) 8.6 1.2 1.5 1.5 2 N S 12.5 15 2 1.5 2 2.5 3 3.5 2 x 2 S Area-Intensity Profiles
  45. 45. DDeessigignniningg G GaauussssSStotonneess i nin D Dififfeferreenncte S Sizizeess Particles Tokens Knobs Multi-core Tokens with ID Tokens without ID Tokens with ID (x,y) (ID,x,y) (ID,x,y,θ)
  46. 46. Knobs - Multi-Core Tokens 1.2 2 1.5 1.5 2 Provide additional IDs and Orientation Information N S 2 1.5 2 2.5 3 3.5 2 x 2 S 2 2 S 0 1 2 3 Using Larger Particles as Tokens 8.6 1.2 2 1.5 1.5 2 N S 12.5 15 2 1.5 2 2.5 3 3.5 2 x 2 S 7.8 2 2 S ID amount = 4 ID amount = 6x2 = 12
  47. 47. Knobs - Multi-Core GaussStones Provide additional IDs and Orientation Information north south Dual-Core Tri-Core Quad-Core B0 B3 B1 B2 Registration Payload 2.16R 2.41R 2R B0 B1 B0 B2 B1 R 1.2 2 1.5 1.5 2 N S 2 1.5 2 2.5 3 3.5 2 x 2 S 2 2 S 0 1 2 3 (x,y,θ) Dual-Core Tri-Core Quad-Core 2.16R 2R 2.41R
  48. 48. Knobs - Multi-Core Tokens Provide additional IDs and Orientation Information north south Dual-Core Tri-Core Quad-Core B0 B3 B1 B2 Registration Payload 2.16R 2.41R 2R B0 B1 B0 B2 B1 R 1.2 2 1.5 1.5 2 N S 2 1.5 2 2.5 3 3.5 2 x 2 S 2 2 S 0 1 2 3 (x,y,θ) (ID)
  49. 49. 1.5 2 2.5 3 3.5 2 x 2 north south Dual-Core Tri-Core Quad-Core B0 B3 B1 B2 Registration 2.16R 2.41R 2R B0 B1 B0 B2 B1 2 S R 1.2 2 1.5 1.5 2 N S Payload [3,2,2] [3,2,1] [3,2,0] [3,1,2] [3,1,1] [3,1,0] [3,0,2] [3,0,1] [3,0,0] [2,1,1] [2,1,0] [2,0,1] [2,0,0] [1,0,0] 2 2 S 0 1 2 3 (x,y,θ) (ID) [3,2] [3,1] [3,0] [2,1] [2,0] [1,0] Dual-Core Tri-Core Knobs - Multi-Core Tokens Provide additional IDs and Orientation Information
  50. 50. ID amount of a k-core knob grows exponentially ID amount of a k-core knob grows exponentially with the core number and the ID amount that a core can provide with the core number the core ID amount 6 15 28 45 14 55 140 285 36 225 784 2025 10000 1000 100 10 1 4 6 8 10 2 3 4 5 ID amounts Available ID amounts that a core can provide ID amount that a core can provide ID amount of a k-core knob: ID amount of a k-core knob with the number and size of core 1.7mm-radius 3.5mm-radius
  51. 51. Possible Generalizations 2. Multi-Part Widgets with ID 1. Stackable Tokens
  52. 52. Stackable Token (Particles with 2 IDs)
  53. 53. Stackable Token (Particles with 2 IDs)
  54. 54. Multi-Part Slider ID part Movable part Multi-Part Widgets (with IDs)
  55. 55. ID part movable part (Conductive) Multi-Part Widgets (with IDs)
  56. 56. Conclusion Interference-Free Identifiable Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays GaussStones Shielded Magnetic Tangibles Project website Discrete Tokens Multi-Token Interactions GaussSense Magnetic Field Camera
  57. 57. Discrete Tokens Multi-Token Interactions GaussStones Shielded Magnetic Tangibles Organic Form Constructive Interactions GaussBricks Single Token Near-Surface Interactions GaussSense Magnetic Field Camera Magnetic Building Blocks GaussBits Magnetic Tangible Bits Project website Project Gauss A system of Hardware, Materials, and Interaction Techniques that Turn Portable Displays into Generic TUI Design Platforms
  58. 58. Project Gauss A system of Hardware, Materials, and Interaction Techniques that Turn Portable Displays into Generic TUI Design Platforms Free-license for Personal Non-commercial Uses Discrete Tokens Multi-Token Interactions GaussStones Shielded Magnetic Tangibles Organic Form Constructive Interactions GaussBricks Single Token Near-Surface Interactions GaussSense Magnetic Field Camera Magnetic Building Blocks GaussBits Magnetic Tangible Bits Project website Rong-Hao Liang1,2, Han-Chih Kuo1, Liwei Chan1, De-Nian Yang2, Bing-Yu Chen1 1National Taiwan University and 2Academia Sinica Thanks for your attention!

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