Optical illusion examples

Obviously, Square A is darker
than Square B. Right?

Graphics: Wikipedia optical illusions page, April 7, 2012 Creative Commons
Slide: e-Patient Dave, Society for Participatory Medicine (e-patients.net blog) Attribution Share-Alike

Obviously, the top circle’s darker,
and it’s in a darker square. Right?


Even if you look again, knowing it’s an
illusion, the illusion’s still real to you.
(Kinda makes a mockery of “I know what I saw!”, yes?)

Obviously, Square A is darker Obviously, the top circle’s darker,
than Square B. Right? and it’s in a darker square. Right?


Decades of research
have shown that
the same thing happens
with many options we’re shown,
not just optical.


It’s a major challenge for social change,
behavior change, and policy change.

Obviously, Square A is darker Obviously, the top circle’s darker,
than Square B. Right? and it’s in a darker square. Right?


The books Nudge, Switch,
and Thinking, Fast and Slow
discuss the challenges
of irrational perceptions.

532 pages, 6”x9.1”

320 pages, 5.5”x8.5” 320 pages, 5.2”x8.5”


I call such perceptions “invisibly irrational,”
because I know what I see – or think I see – 532 pages, 6”x9.1”

and no amount of information
will change an illusion, optical or other.

320 pages, 5.5”x8.5” 320 pages, 5.2”x8.5”


I call such perceptions “invisibly irrational,”
because I know what I see – or think I see – 532 pages, 6”x9.1”

and no amount of information
will change an illusion, optical or other.
We need to understand this about
ourselves and others, realize that certainty
can still be wrong, and help reach good
choices – despite the illusions.
320 pages, 5.5”x8.5” 320 pages, 5.2”x8.5”


Blog of the Society for Participatory Medicine

ParticipatoryMedicine.org


Optical illusion examples

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