The primary function of art (it may have others, but this function is what defines it as art) is to create a response in the person experiencing it; it is not without function.

Or rather, art's primary function is expressive or communicative, while craft has other primary functions.

Can't craftsmanship have artistic flair? The result of creative emotional expression while crafting?

> Art has no function.

Can you name an art piece that has no function?

So architecture cannot be art?