In this program, a dot goes to the top left. If it reaches a white dot, it goes down, and if it reaches a black dot, it goes down-right. Assuming you don't change anything in the program, it will take 1267650600228229401496703205376 iterations (an iteration is going once from top to bottom) for this program to repeat. Downloaded, and on turbo speed, I measured that it would take 250 billion times the currect age of the universe (at .0867 seconds per iteration, measured, age of the universe being 13.7 billion years) to repeat. Flash player should be faster, but unless it can go trillions of times faster than downloaded, I doubt you will see this repeat over your lifetime. Holding space slows the animation down.