No one said anything about simultaneous. Stand on a beach, any beach in the world, looking straight out at the water. Turn 90 degrees left; now the water is o

No one said anything about simultaneous. Stand on a beach, any beach in the world, looking straight out at the water. Turn 90 degrees left; now the water is on the right. Look straight out again, then turn 90 degrees right; now the water is on the left. Tada! You have just done the "impossible".