Jugglers needed (base version): 4 good
This pattern is a moving version of trapeze (have a look first if you don't have a clue as to what trapeze is).
It involves moving from the front to the back (or vice versa) every 4 beats (or every other pass if not passing in 2-count). In this manner, jugglers always find themselfs back in the trapeze formation to make crossing passes, thus avoiding collisions. Each movement is made immediately after each crossing pass in such a way as to be in position for the next crossing pass.
Solids or other