Definitions of Square Dance Calls and Concepts

From a 4 x 4 Matrix, visualized as 4 adjacent Columns | Lines | Waves. EN: 10

Split the 4 x 4 Matrix into two sets of adjacent Columns | Lines | Waves and work in the resulting 2 x 4 Matrix on each side. EN: 20

 Work with these positions forSplit Phantom Columns EN: 30 beforeSplit Phantom ColumnsTriple Cross after
 Work with these positions forSplit Phantom Lines | Waves EN: 40 beforeSplit Phantom WavesIn Roll Circulate after

Notes:
• If the given call requires you to know the facing direction of a phantom, look at that phantom's opposite within the Split Phantom Columns | Lines | Waves formation. Hopefully that spot is occupied by a real dancer, in which case your phantom is facing the opposite direction of that dancer. This is known as Assume Symmetry. Some callers believe you should always do this; other callers believe you should never do this (I am of the latter opinion). EN: 50
• If the caller says Split Phantom Waves, then you have more information about the facing direction of the phantoms: they must be in Waves! EN: 60
• Imagine there is a brick wall dividing the two halves of the set. This can prevent you from crossing over into the other half of the set. EN: 70
• Shape-changing calls are allowed. Do the given call, keeping track of the phantoms, and breathe as necessary so that the two resulting formations are adjacent to each other. EN: 80
• Historically, Split Phantom Columns | Lines | Waves have also been known as Phantom Split Columns | Lines | WavesEN: 90

From a T-Bone starting formation, each dancer individually determines how to split the 4 x 4 formation. EN: 100

 beforeSplit Phantom WavesIn Roll Circulate after
Split Phantom Columns | Lines | Waves is also occasionally used from a 1 x 16. EN: 110

 Work with these positions forSplit Phantom Lines EN: 120