Contact Improvisation is a movement form devised by Steve Paxton and a small company of dancers in June 1972, at a series of public performances called Magnesium at Oberlin College. The premise is austere: two or more bodies sustain a point of physical contact and improvise the dance that follows from it, attending continuously to gravity, momentum, and the felt geometry of their shared mass. No music is required, no costume, no score. What the dancers learn — slowly, through hundreds of hours — is how to fall, lift, roll, and counter-balance with another body, attending to the centre of mass the contact creates. The wonder is that two bodies, each only ever in partial control, produce a third movement neither could have rehearsed. Contact Improvisation is among the few twentieth-century dance forms to have generated its own ongoing oral tradition (open jams in cities worldwide), its own literature (Contact Quarterly, founded 1975), and its own ethic of consent and listening. It belongs in the Academy as the wonder of co-operative kinetic discovery.