Here is a link to a nice video from George
Hart on the Bridges show last summer in Enschede, the Netherlands. This may be the largest Mathart show that has ever been curated.
One of my wishes for mathematical art is that it somehow ties to culture and has a strong sensory presence. I think Robert Bosch's serenity machines are a good example of contemporary art with a foot deep in Zen. This pieces are mazes with no end and no goal. You turn the knobs to move a small steel ball around the maze.