椅子存在吗？Do Chairs Exist?[Vsauce]

A Vsauce video exploring whether chairs exist, through metaphysics, mereology and the philosophy of categorizing objects. It runs about 38 minutes and cites academic work on ontology.

Why HN likes it: HN recommends it as an entertaining tour of how we define and categorize things, and it is cited when concept boundaries come up.

“it's basically an entertaining, whirlwind tour of the philosophy of categorizing and labeling things”