Whether it's a fake wall, or a hypnotic image, optical illusions are extremely captivating and confusing. At the end of the day though, they are simply just tricks on our brain. Scroll down to check out an example of an Interactive Optical Illusion.
Stepping Feet Illusion
The Stepping Feet Illusion appears to show the yellow and blue blocks 'tip-tapping' across the barred plane. However, it is simply just an illusion that your mind plays on you when the two blocks slide across the plane, as the two blocks are moving at the same pace, at the same time.
Hint: If you are having trouble seeing illusion, look at the blue square(s), and notice the stepping sensation in your peripherals.
Note: If the animation is blurry, try shrinking the size of the window and the illusion may be more apparent.