This "quick tutorial" introduces the general idea of a call and explains the most common cases. It does not explain or illustrate all cases. For additional details and/or examples, refer to the links in the "MORE INFO" box.
Note that the dancers in each line remain in their own line.
The "rolling" action for the three dancers who aren't out-facing ends is similar to a Run. Each of these dancers independently identifies the direction to move based on the starting location of the dancer who is circulating to the other end of the line, and in one smooth motion starts turning and moving in that direction, stopping when they have moved over one spot and turned around halfway.