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.
The ends do 1/2 Zoom, then Cast Off 3/4, and then Spread.
The centers do something different depending on whether they are leaders (facing out) or trailers (facing in), but either way they end up back in the center box.
Typically in the center there are two leaders and two trailers. The lead centers do a Cloverleaf, around the outside of the square, and after waiting for the ends to get out of the way come back in to be trailers. The trailing centers walk straight forward, without turning, to take hands with each other in the very center of the square, then they Hinge and step straight forward again to become leaders.
If the dancers start in parallel two-faced lines, they will end in parallel waves.
If they start in parallel waves, they will end in parallel two-faced lines.
If all the centers start as leaders, then they all do a Cloverleaf, and all come back in as trailers.
If all the centers start as trailers, they can't all do a Hinge in the center. So instead they all Pass Thru, Face In, and then Pass Thru again.
Note that, regardless of the starting formation: