I was looking through back issues of Make Magazine when I came across the lunchbox laser shows
, which I decided to make a simpler version of. The three main components are the $4 laser pointer, the spinning plastic disk that warps the beam, and the spinning mirror that directs the beam upwards. The laser is placed far away from the rest of the setup to magnify it as much as possible. It's all glued down to a scrap piece of wood for a base. The very simple electronics setup is composed of two motors, two potentiometers to slow them down (by a bit) an on/off switch and a nine-volt battery. I had everything on hand except for the laser and the mirrors, so I only spent $11 on it. The next one I build will allow for adjustments, this one is permanently set.