How does a chair not exist?

A chair does not exist because it is not a natural from, meaning it does not grow or live naturally. A chair comes from wood, which comes from a tree, a tree exists because its a natural form. A tree acutally exist and a chair has the potential to exist but does not not since it is man made. to understand more read Aristotle metaphysics in the book of Plato. It is an object that helps you sit down