I see multiple posts saying they wear camo to conceal their movement, but I don't understand that. How does camo conceal movement?

Camo, by design, is made to make you look like trees, bushes, leaves, etc. When the camo moves, the deer would still see the movement, wouldn't it? If the tree you are in is not moving, but your camo is, the deer would still notice movement I would think.

Am I missing something here? I don't see how camo conceals movement any better than other clothing.