Object permanence is the understanding that objects continue to exist even when they cannot be observed—this understanding doesn’t develop in the human brain until post-infancy, which is why babies find the game peekaboo so entertaining. With every reoccurrence, a surprise.

(Sometimes I forget that people think of me even when I am not right in front of them. Sometimes I am so startled by the space I take up in other people. That they allow me that.)