Sometimes an idea comes along that results in an object that doesn't actually do anything. As Oscar Wilde said, "all art is quite useless," by which he meant it's not useful. It doesn't help you play a game or wash the car or hold up your pants. It just sits there and looks pretty. Or interesting. Or, ideally, both. 

That's what I am trying for, at least. How successful I have been, you will have to judge for yourself.