tree, etc.
Sorry, kinduva tongue-in-cheek question.
Everything with the exception of a balloon can be zipped up -
in different meanings of the word zip, of course.
One of my college profs (now deceased) used to administer IQ tests and he related this story to us in class: A little, black girl (I think he said she was nine) had the highest IQ he'd ever personally measured - except she missed a question the answer to which he thought was obvious. He asked her about it. I don't remember the whole story or the particular set of items, but I remember how her response started - "Well, you can zip up a tree..."
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