Here is hopefully complete (and corrected) teaching advice, geometry and end effects for the zigzag dance, each cycle of which leaves dancers on the opposite side from which they started. What I am referring ***** What dancers need to know about the zigzag dance a) Couples progress towards the end of the set to which their left shoulders initially point. In practice caller should reference geometric features of the hall (e.g. windows) b) Each cycle through the dance leave dancers progress, but on the opposite side of the set c) The one poussette in each cycle of the dance is CW and moves dancers in the direction of progression d) Dancers out at the end dancers out at the end face back in with the lark on the right, ready to re-enter the dance with either a poussette or a balance and petronella *** For those interested, a complete geometric analysis of the dance including end effects follows *** The one pousette in each cycle is CW and moves dancers in the direction of progression. The poussette in the first cycle is around the current neighbors The poussette in the second cycle is around the new neighbors. After the poussette in the [first]/[second] cycle, new neighbors are found [in]/[opposite to] the dancers' direction of progression. The balance and petronella after the poussette always occurs with the new neighbors Couples out at the end always face back in with the lark on the right. Dancers out at the start of the first cycle, re-enter the dance with the balance and petronella which follows the poussette Dancers out at the start of the second cycle, re-enter the dance with the poussette Starting the dance at 5) has the dance cycle between the 2's and the 1's being crossed over.