A Butterfly consists of dancers occupying the following spots in a 4 x 4 Matrix: 
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 Butterfly FORMATION   
 
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 |  |  From here...  |   |  imagine you are here.  |   
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 A Butterfly is considered to be distorted Columns, as if the outside
  dancers slid apart from normal Columns. 
 
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 |  before Butterfly Circulate |   |  imagine you are here  |   | after
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 Traffic pattern: For simple calls (such as Circulate, Walk & Dodge, etc.)
  move directly to your ending footprints.  For more complex calls,
  start the call working distorted, blend into a normal setup, complete
  the call normally, and then have the resulting Ends move away from
  the Center in order to re-establish the Butterfly footprints. 
 Sometimes the caller may wish you to start the call in your Butterfly
  but finish in a normal setup.  In these cases the caller will put a suffix such as
  'To Normal Waves', 'To A Line', 'To Columns', etc. (e.g., Butterfly
  Transfer The Column To Normal Waves). 
 Note: A Butterfly can also be 
  T-Bone 
  in which case you do your part working within your set of distorted Columns. 
 
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 |  |  From here...  |   |  imagine you are here...  |   |  ... or here.  |   
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Mini-Butterfly [C1V]:
 A Mini-Butterfly is a 6-dancer Butterfly.
  E.g., from an Hourglass Ignore the points of the Center Diamond.
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 Mini-Butterfly FORMATION   
 
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 |  | Mini-Butterfly |   |  think of working here  |   
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Big Block CONCEPT [C3A]:
 From applicable 4 x 4 Matrix formations such as
  Interlocked Blocks, 
  a Butterfly, 
  or an 
  "O".
  Do the call working in distorted Parallel Lines.
"X" CONCEPT [C4] (Jim Davis):
 An "X" occupies the same footprints as a Butterfly but is considered to be two diagonal Columns 
  which cross over each other in the middle.
  An "X" Circulate is the same as a Butterfly Circulate, except that the #3 dancers 
  (in-facing Centers) do a Concentric Box Crossover Circulate
  (Jaywalk with each other).
 See also "O" FORMATION [C1]
 and Squeeze [C1].