If stars themselves are giant balls of gas and appear as dots in the night sky, why is it so common to draw them with pointed arms? Minute Physics explains how the light from stars interacts with our eyes to create that "star-shaped" image.

What's particularly interesting isn't just how waves of light diffract when they reach the suture line of our eyeballs; it's how the experience varies from individual to individual. Thanks to Minute Physics for this eye-opening look into an everyday image.

[via MetaFilter]