And after about 15 seconds, the raisins were rising and falling. You've probably done this before. Not really about the cinderblock, but something similar. I'm curious about how you suspended it. We've got the one at Griffith, but it has a special circular magnetic interface that keeps yanking on the wire to keep it going.
Teaching is the easiest job to have when it's done badly.
Teaching is the hardest job to have when it's done well.