Similarly, if you come to a card which is BLACK, put it face-up on your BLACK pile. Think BLACK and select a random face-down card. Put this face-down card in a pile in front of your BLACK pile. Go through this procedure until you run out of face-up cards. You now have the following: a RED pile and in front of that a pile containing the same number of face-down cards you selected while thinking RED. You also have a BLACK pile in front of which is a pile of random cards you selected while thinking BLACK. Interestingly your thoughts.
