Amy's Designs

A few links on how to create optical illusions: 

Lines and a diamond - on photoshop

Negative image changing colour - on photoshop

Black and white moving

A lot of M.C Escher's work involved cognitive optical illusions - parallel lines that look uneven. He also made repeats of one image, that when you look at the spaces in between they are also an image.

Physiological Illusions

• Physiological optical illusions rely on the ways that our brains process information. They encourage us to see things that aren't there. Grids of squares that appear to have dots in the middle are physiological optical illusions as are circles that appear to move even though they are standing still. These types of optical illusions can include afterimages such as what happens when you stare at a brightly colored picture and then look at a white sheet of paper.

  Other Optical Illusions

  • These are just a few of the categories of optical illusions. Other optical illusions include impossible situations such as one where water appears to run uphill. Another popular optical illusions is one where it is possible to see two different images but not at the same time. Illusions that fall into this category include the old woman, young girl illusion and the vase, girl illusions. A person's brain can switch back and forth between the two pictures but cannot process both of them simultaneously.

    - ehow