Solution: Up and Down the Staircase
The following diagram of a slice Penrose drawing should provide you with an understanding of how this illusion works. Note how all lines; 1, 2, and 3 appear to spiral upwards.
The following diagram of a slice Penrose drawing should provide you with an understanding of how this illusion works. Note how all lines; 1, 2, and 3 appear to spiral upwards.