Liminal Space is an aleatoric piece for cello, motion capture, and interactive software. It explores what happens when the past – J.S. Bach’s Sarabande from Cello Suite No. 1 in G major (BWV1007) – meets the present, i.e., movement computing, stochastic music, and interaction design. Through aleatoric means, the composition creates an interface between a cellist and a dancer. As the dancer moves, she creates sounds. The two performers engage in a musical dialog, utilizing Bach’s original material.