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OPTICAL ILLUSION

By

Hina mehboob

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

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.

History Of Optical Illusion

• 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 IllusionBack 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?

• 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)

• 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.

• 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.

In the 1930's and 40's M.C Esher did pictures ofmind boggling pictures

Rotating Wedge Illusion

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

Black Dot Illusion

Count the black dots!

Color and shapes

Spontaneous Motion Illusion

Are the horizontal lines parallel or do they slope?

Café Wall Illusion

Size Illusion

Would you believe that the center circles are the same size?

• 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.

texture

Can you find the dog?

Oscillating FigureIllusions

Perspective and depth

Do you see a cube missing a corner?Or do you see a small cube in a big one?