How do our eyes let us see colors and shapes?
Light's Journey In
How do our eyes let us see colors and shapes?
Right now, light is bouncing off everything around you — your hands, the wall, this very page — and a little of it is sneaking into your eyes. Somehow, that bounced light turns into a world full of red apples, square windows, and the face of someone you love. So how does a splash of light become seeing? Let's follow it in.
Light enters through a clear window at the front of your eye, then slips through a little black doorway called the pupil. The pupil is the dark circle in the middle. It's actually a hole — and it changes size, opening wide in dim rooms to let more light in, and shrinking in bright sun so you're not dazzled.
