Patriotic Ropes, Cotton by Ronjo

You show three different color ropes, a white rope, a red rope and a blue rope. The ropes are knotted together to make one long rope with two knots on it.

You then coil the rope around your hand. When the rope is uncoiled the knots are seen to have vanished and the three short ropes are seen to have blended together into one long tricolor rope.