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 ...

Escher and Penrose found inspiration in each other’s work. In 1952, University College London awarded Penrose a bachelor of ...

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.

Unlike the previous speculated solutions to Escher’s waterfall this one manages ... The hardest part of the illusion seems to be modulating power to the pump in order to time it with the liquid ...