From a four person box: Leader folds into adjacent spot while trailer walks ahead to replace the leader ahead. From facing pairs: Those designated fold into adjacent spot while others walk ahead to replace the opposite folder.
COMMENT: We might have done well to keep Walk and Turn--it could have been used in place of Box Circulate, Split Circulate and various modifications of Swap Around. In today's choreography, the term "Flip" is now used to describe the move Holman called "Turn."