You'll never see your own eyes move

Try it in front of a mirror: look at your left eye, then your right, and back again. You see both eyes still at each point, but you never see them making the trip from one to the other. Someone standing beside you would. You won't.

The mirror isn't slow and your eyesight isn't failing. It's that your brain switches off the image while your eyes move at full speed, in those lightning-fast jumps called saccades. During that instant, what comes in would be a dizzying blur, so the brain discards it and fills the gap with what it sees before and after.

The result is a seamless film edited over gaps you never notice.

Your life feels continuous, but you go briefly blind every few seconds. And you had no idea until now.