A human is different than “humans” a human with a stack may sort it into four stacks and then sort amongst them, yes. But a room of five clerks all taking task

A human is different than “humans” a human with a stack may sort it into four stacks and then sort amongst them, yes. But a room of five clerks all taking tasks off a pile and then sorting their own piles is merge sort at the end of the day. Literally, and figuratively.