T-Bone is a name given to any (usually rectangular) setup in which at
  least one dancer's facing direction is 90 degrees off relative to another
  dancers' facing direction.  The word 'T-Bone' is typically not said
  unless the caller wishes to emphasize that the dancers should pay attention.
When doing calls from T-Bone formations, do your part of the given call.
  Assume that dancers T-Boned to you are facing in whatever direction is necessary
  for you to do your part of the call.  Usually, you will not interact much
  with those who are T-Boned to you, and the call may feel quite different than
  when done from a normal setup.
When executing Circulates (and calls involving Circulates) the Lead dancers
  who make a loop as part of their traffic pattern must move around
  the outside of any dancers who are moving straight ahead.  This means
  that some dancers may pass Right-Shoulders while other dancers may pass
  Left-Shoulders.  Be careful to pass the correct shoulder since the caller
  could fractionalize the call.
| |   |  |   |  |   |  | before Box Circulate
 |  | after 1/2 Box Circulate
 |  | (done) | 
 | 
| |   |  |   |  |   |  | before (all 8) Circulate
 |  | after 1/2 Circulate
 |  | (done) | 
 | 
Notes:
- 
When done from T-Bones, calls that normally end in Lines often
    end in Diamonds and vice-versa.
- 
Be very precise with your positioning when doing calls from T-Bones.
    Make sure your formations are compact and that you are directly lined
    up with a wall.