Use up/down(size) and left/right (speed/direction) arrows to adjust the sprite. It is only a black and white image but at the right speed and size (for your pc) you will see the dashed lines take on colors.
http://scratch.mit.edu/projects/Locomule/715815
ps. This works far better by hand by printing the disk pattern on a piece of paper and spinning it (make into a top, put a pencil through the middle etc) I'm only seeing blue, green, and maybe yellow on my pc version. I taught a class using a kit that had this disk in it along with a solar powered spin motor. We used flashlights to run/adjust the speed of the motor and we could see all the colors more clearly plus red. Peace.
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