You ever thought about turning a shadow into a puzzle? I've got a trick that hides clues in the dark—might give you a run for your money.

Sure, here’s a quick one: take a flashlight, point it at a plain wall, and move a small object—like a coin—around in a straight line. The shadow will be a perfect straight line, but if you change the angle just a little, the shadow wiggles. Now, line up the shadow with another object on the floor. When the shadow lines up, you’ve found the hidden spot—no secrets exposed, just a trick of light. Try it and see if it keeps your mysteries safe.

Okay, pick a room with a single source of light and a piece of cardboard with a tiny cutout of a shape you like. Hold the cardboard close to your chest and move it slowly—your own shadow will follow the cutout right on the wall next to you. Then, try to step exactly between the light and the cutout so that the shadow is right next to you, almost touching. It’s a game of timing and distance, and it keeps the shadows right where you are. Give it a whirl and see if the dark stays loyal.