So your Prop clock spins laterally?
I guess thats best for a number display or even text.
The one I am working on spins vertically so that if all LED's are on, it makes a disk in the air. If I ever get back to work on it, It has about 20 RGB LED's and two lines wired for text output. It should be really cool when done, I just need to get back to it. The fan motor I had it on decided not to spin freely anymore after I stupidly took it apart so now I need to go buy a new fan or use a different motor.
~Mike