The illusion works because of the “shadow” that falls on the checkerboard. Lets think of the square that the shadow falls on. Now picture that
For 25 years the artist Kurt Wenner has been using complex calculations from his old job – creating conceptual drawings of extraterrestrial landscapes at NASA
Nasa's probe sent back photographs from Mars of what appear to be trees on the planet's surface. But it is an optical illusion - they
In this video, wooden balls roll up the slopes just as if they are pulled by a magnet. The behavior of the balls seems impossible,
