Shift when you hit the green arrow to enter turbo mode space bar to clear and stop everything right for one set of squares, then hit the space bar to stop and clear, then left for the other set of squares Yes, this is all that it does.
This is an iteration of a Logo program that Brian Silverman started with me during CMK15. I have made changes to his program to make it work better. This is close to something I saw in Logo but not yet 100% This is where I'm at now.... more to come... The key to a smooth spin is to take out the 'add one to spin' command, that seemed to speed the spin up consistently and then it would appear to slow down. This version eliminates the extra spin command and has a smooth spin. On to round three. I will make a remix of this program soon.