Optical Illusion- The Tiny Horizontal Lines
I'm really getting into optical illusions!
Move your mouse to turn the sprite. I encourage you to download and look at the scripts. There's not much.
How it works:
There are two identical bunches of tiny horizontal lines. One is Sprite 1, and one is the Stage. Sprite 1 turns while the Stage stays in one place. The identical lines being in another directions fill in certain places on the screen, tricking your eyes to believe the lines are actually vertical.