So many of my 'arty' friends tell me that art 'speaks to you'. One day I was in the art museum & was looking at a black canvas with a yellow stripe down the middle of it. I kept thinking about what they said about it speaking to me, so I stood & stared & stared, but obviously it wasn't in a talking mood that day. It was a black canvas with a yellow stripe down it.
Just before reading this thread I was looking at Blastradius's design for the 9/11 graphic. That spoke to me.
So I would have to say that 'perception' decides if it is art or not.