This is an observation game. Divide the den into two teams. Give each team a dozen or more common articles-pencil, ball, card, a toy truck, Cub Scouting book, jackknife, paper clip, etc. Ask the teams to go to opposite sides of the room and arrange their articles on the floor any way they want as long as the items are six to twelve inches apart. A leader should note the final arrangement of the articles on a sheet of paper.
Each team then goes to the other's team's arrangement and looks at it for exactly 1 minute. Then they gather up all of the articles, return to their original place, and try to arrange the articles the same way the other team had them. The team with the most articles placed in the correct position wins.