Some say art is a window. Sometimes I look out of a window, but not at anything. Maybe I have a pretty vacant, dumb expression on my face. Some art can be like this too. You're looking at it, but not particularly into it. This is not necessarily a bad thing. On a sluggish Wednesday morning this vacant staring is comforting and soothing.
The problem with windows is people can see your dopey, zombie expressions. When you're vacant staring at art, you look cultured and intellectual. People around you become curious to look at what you're so captured with. You might be dead brained, but you're effectively making the person looking over your shoulder really think about the art. Although there's nothing there, your neighbour just might think up the meaning of life.