A new exhibit at the Des Moines Art Center comes from an artist who doesn’t use paint and canvas. The Tony Oursler exhibit uses video images and sound to create floating images, similar to a robot, which the artist says speak and “challenge the viewer.” Oursler says there’s lots of videotape and a take-home c-d rom’s available. It took decades for photography to be considered an art form, and Oursler says it’s taken awhile for videotape, too, but videotape’s now in art collections around the world.The Oursler exhibit will be at the Des Moines Art Center through January 21st.