an hourglass: Each dancer does a Circulate by moving forward one
position in the hourglass, to take that dancer's place. Dancers
move along the path shown:
become centers, and centers become points. Also, the diamond
dancers move to the box, and the box dancers move to the diamond.
Teaching: Tell each dancer to move up to the next person's spot in
the hourglass, taking his footsteps. During this call, everyone
keeps the same shoulder toward the center of the set. This is a
good call for using a demonstration square.