But, doesn't art have to have an evocative purpose to be Art? Art is usually used in relation to entities that have an aesthetic property of some sort (where "aesthetic" is used in its philosophical sense, not just meaning "beautiful").
If I understand dannthr and Reedbeta position correctly and, purposely, in a limited and unflattering way, Art does not have to evoke an effect, it just needs to broadcast "something".
Therefore, a restroom sign is Art? I mean, sometimes, with me, it evokes the emotion of relief, but that's usually only because I drank too much beer too fast...
Or, a math/science textbook is Art since it forces you to question assumptions? ("The earth isn't flat?")
It may be semantics. When I say "art needs to evoke one or more emotions", the reaction does not have to be an intense one. It could evoke a "quizzical look", "mild comfort", "happiness", or "slight nausea and headache". But, Art usually has intention, and the intention is not necessarily a rational product.
Although I am debating, I think we may be circling some agreement. Immanuel Kant called Art "...a kind of representation that is purposive in itself and, though without an end, nevertheless promotes the cultivation of the mental powers for sociable communication." You can see the "cultivation of the mental powers" as the "makes you think" that maybe Reedbeta intends. The use of "purposive" implies that the artist has a goal in creating the Art; I just think that part of the "makes you think" must involve an emotional component. I can teach you math and "make you think". Art does something else; it changes your subjective perception of the world and, as such, must involve an emotional component.