Here is my new data center! I used one of those big oil pans from Walmart (in the automotive section for about $10) and mounted it to the back of a shelf with 3M removable Command adhesive. Inside each ball there is a magnet! I cut a small slit in the ball and dropped in a small powerful magnet. Students are loving moving the ball with their name into the appropriate column according to the question. This has been so much fun for everyone!