Wacky Stacks were a stacking toy made in the late 60s/early 70s that the Muppet Workshop would use to make eyes. When the company went out of business, Jim Henson bought out the remaining supply and they are still in use today at the workshop. To answer the inevitable question, no they can't be bought in stores any more! I've never seen them on ebay, but they might show up sometime (you never know). If they ever do, you'll be bidding against me for them.