Reality is a matter of perception, I think that art actually teaches philosophy better then a thousand philosophy books. We define our reality by our perception, space is defines by our minds, texture by distance. In art there is the concept of performance art something experience as it happens rather then looked at as a static thing. it was a rebellion against the concept that art was a commodity, something definable. Life is performance art, it is the now. The other metaphor I like is the one of a river, if you look at a river the water is in constant motion. There is no river but there is if you accept that it is a constant state of change. "Now" exists like the river or like the performance art it is the experience not the thing.