The furniture issue is actually more difficult than I'm making it out to be. There are many museums with furniture, clothing, etc., and architecture is in the same category.
The MOMA exhibits suggest that the industrial design is the art, and the manufacture of the furniture is the craft.
More generally, the thing that makes these kinds of things interesting is usually something beyond their functionality, such as design, surface, etc. On the other hand, some would say that the most interesting forms are those that follow function, so it may not be possible to separate form and function in a chair, building, or evening gown.
The "fine" (as opposed to "applied") art photograph, painting, sculpture, or musical or literary work, however, has no function other than to be itself. Of course few works are really that straightforward in their intentionality, or they wouldn't be interesting.