Some time ago I made a still life of a plate of pears that I put on a chair.
I put it there, so I could look down on the plate, and because a chair has a nicer shape than a flat table.
Well, there were more people who thought so! The more I looked, the more chairs I came across that were not sat on.
Sometimes a plate or vase is put on them, or just an apple, and sometimes you can hardly see the chair.