Optical Illusions

When you first look at this, how many colors do you see When you first look at this, how many colors do you see?   Some might say they see 3 or even 4 colors, but there are 2--red and green!  People usually think they see 2 shades of red, but there is only 1.  Look closely and you will notice on one side that white boxes surround the red boxes, and on the other side, green boxes do!  Due to the placement of these boxes you get the "illusion" of different colors.  Since white is not considered to be a color (it is the presence of all colors in scientific terms) we can safely say that there are 2 colors present here!  Still don't understand?  

Write down what you see in this picture.

Write down what you see in this picture.

Write down what you see in this picture.

Write down what you see in this picture.