What are active phantoms?
The concept with active phantoms, used after one of the assume concepts (either an explicit one like assume waves, or an implicit one like split phantom waves), effectively places invisible but otherwise intelligent dancers on the phantom spots, with facing directions deduced from the assumption. Those phantoms proceed through the entire call, interacting with each other and with the live dancers as necessary. If the call is impossible for the phantoms to do, or if illegal collisions occur between live dancers and phantoms, it is an error. At the end of the call, any live dancers or phantoms that come to the same spot may take right hands with each other, if that is appropriate for the call. Note that this is contrary to what dancers generally expect when working with phantoms. Most of the types of assume concepts are sufficiently explicit that, if even a single live dancer is present in the setup, everyone’s facing direction may be inferred. This is necessary for the with active phant
