Noll sets a timer and looks at you with a playful competitive look.

"Ready. Set. Go." The two of you start painting on the canvases. After five minutes, you have to switch, and then Noll will add to yours, and you'll add to his.

After five minutes, the timer goes off, and then he says, "Switch!"

He switches yours with his, and then he sets the timer again for another five minutes.