If you saw the movie Inception (we highly recommend you do) you will remember the infinite stair puzzle that is exposed as an optical illusion. [David’s] proposed method for debunking this hoax ...

Cerebral puzzles and visual riddles--like optical illusions and brain teasers--trick the intellect, so you can either have thrilling "brain" adventures or test your IQ. From Escher’s impossible ...

The effect is like the famous Escher staircase which appears to be ... that gently gets louder and fades in. This creates the illusion that the sound is always rising in pitch.

The distinction between reality and perception is blurred by brainteasers, optical illusions, and Escher's inconceivable geometries, as well as the timeless "Which line is longer?" puzzles.

Would you please consider either designing a "picture" for it, or have you any unpublished works which you might think suitable -the "optical illusion ... M. C. Escher. According to the forum ...