Optical Illusion Quiz

Visual Illusions have always been a curiosty to the human eye. They are a way of demonstrating how our visual system can be "tricked" into seeing things that are not really there or inaccurately seeing things. There are many types of illusions that we have been introduced to through out this semseter. Mach Bands, which small changes in lightness are seen near boarder even though no changes are present in the physical pattern of the light. There is also White's Illusion whoch is when two physically identical fields can appear diffrent. The Herman Grid, is when two alternating scenes appear similar even though there are diffrences between them, this is another illusion. There are many more these are just a few interresting ones.

http://www.illusion-optical.com/Quiz/ Take this you will be shocked!

White's Illusion

White's illusion is shown with two rectangles, named accordingly A and B. Both rectangles are covered with black horizontal stripes. Rectangle A is shown in between the black stripes while rectangle B is shown on top of the black stripes. This creates the illusion that rectangle A is darker than rectangle B. However, both rectangles are printed from the same color ink and when the black horizontal stripes are removed, the observer is able to notice they are actually the same color.

Stimultaneous contrast occurs when our perception of the brightness or color of one area is affected by the presence of an adjancent or surrounding area. This is most intense when when the two colors are complementary colors such as in White's illusion, black and gray.

Below is a video posted to demonstrate simultaneous contrast. Notice how the square in the center remains the same color throughout the clip:

http://www.youtube.com/watch?v=rnVhD-ke9Qg