The people at GroundWorks Dance Theatre, the locally based troupe whose motto is Imagination You Can See, take a rather esoteric approach to the art form. Take, for example, the inspiration for "Emergent," one of three works on the slate for tonight's performance at the Allen Theatre. Artistic director David Shimotakahara has said he was looking at theories concerning the "behavior and evolution of complex systems" when he came up with the concept for the piece. Heady stuff. You can see it as well in "After Chorus," a new work by an Israeli choreographer, and "Inamorata," a piece for duets, trios and ensembles, tonight at 8 and tomorrow night at 8. Tickets are $20 to $25. (Niesel)