While this isn't really a tool I adore it! I actually have two in my metal studio and need to get a couple for the glass studio. They are solar powered unit that spin when the sun hits them, spinning and sending rainbows all over the walls. Mine start to work at about 5 in the afternoon, the time of day I normally start to run out of steam. They always make me smile and I usually work for at least an extra hour or two once they start up. I've seen them on amazon!