Good Eye: Guess the Size

How many inches is that? No ruler, no grid. Just your eye.

How good is your eye, really?A shape appears on screen. You name its size in inches or millimeters. No ruler, no grid, nothing to compare it against. After every guess the shape comes back at true scale with a ruler against it, so you see exactly how far off you were.Every run ends with your score, and your best score waits on the home screen for you to beat.WHERE THE IDEA COMES FROMNikola Tesla built his machines i…