Optical illusions visually trick the brain by making images appear different than reality. There are three main types of optical illusions - literal illusions that create different images than the objects, physiological illusions caused by excessive stimulation of the eyes/brain, and cognitive illusions from unconscious inferences. Throughout history, different types of optical illusions have become popular based on the time period, including ambiguous images from the early 1900s and abstract op art in the 1960s that appeared to move. Optical illusions work because the mind cannot view exact details or multiple images at once, instead interpreting visual stimuli in a way that creates illusions.

1. OPTICAL ILLUSION
By
Hina mehboob

2. Optical illusion
Optical illusion is visually perceived image that
differ from objective reality.
Information gathered by the eye is processed in the brain to give
a perception that does not tally with a physical measurement of the
stimulus source.
The word optical means something to do with the eye. The word Illusion means
its something that's not what it seems. So the word OPTICAL ILLUSIONS means
something that isn't what it looks like

3. Types of illusion
There are three main types:
• literal optical illusions that create images that
are different from the objects that make them,
• physiological ones that are the effects on the
eyes and brain of excessive stimulation of a
specific type (brightness, colour, size, position,
tilt, movement), and
• cognitive illusions, the result of unconscious
inferences.

4. History Of Optical
Illusion

5. • During the different periods of time different types of optical illusions have
become popular. Here are some different examples of all the kinds of
illusion art.
• A Famous Illusion
Back in 1915, a cartoonist named W.E. Hill first published this drawing. It's
hard to see what it's supposed to be.
• Is it a drawing of a pretty young girl looking away from us? Or is it an older
woman looking down at the floor?
• Well, it's both. The key is perception and what you expect to see.
• This simple line drawing is titled, "Mother, Father, and daughter" (Fisher,
1968) because it contains the faces of all three people in the title.
How many faces can you find?

6. • Optical illusions work because our minds
aren't made to view exact cuts or two
pictures at the same time. Therefore, our
mind shows us an illusion but the main thing
that makes an illusions are the colors( If the
illusion isn't moving ). Almost everyone sees
an illusion each day. For instance, every
animation or movie is an illusion. It's just a
bunch of still pictures played very quickly at
the movies. It's always an illusion (animation
or even if it's 3D)

7. • In the 1900's pointillism was a kind of art, created
by Gorges Seurat was what looked like an entire
picture, but it was made out of tiny dots.

8. • In a sense all painting is based on tricks of visual perception: using rules of perspective to
give the illusion of three-dimensional space, mixing colors to give the impression of light
and shadow, and so on. With Optical Art, the rules that the eye applies to makes sense of
a visual image are themselves the "subject" of the artwork.

9. In the 1930's and 40's M.C Esher did pictures of
mind boggling pictures

10. the 1960's, the term "Op Art" was coined to describe the work of a growing group
of abstract painters. was a type of art that looked like it was moving
Rotating
Wedge
Illusion

11. Black Dot Illusion
Count the black dots!

12. Color and shapes
Spontaneous Motion Illusion

16. Café Wall Illusion
Are the horizontal lines parallel or do they slope?

18. Size Illusion
Would you believe that the center circles are the same size?

19. • In the mid-20th century, some artists experimented with
Optical Artwork, although not abstract, also deals extensively
with various forms of visual tricks and paradoxes.

22. texture
Can you find the dog?

23. Oscillating Figure
Illusions

26. Perspective and depth
Do you see a cube missing a corner?
Or do you see a small cube in a big one?