We are developing a new set of movement experiences titled Crenulations and Excursions. This work consists of two aspects: a public installation that allows visitors to explore a rich sonic space through their expressive movement, and a short dance performance that allows a trained performer to explore the expressive capabilities of the installation environment. With a tiny, energetic gesture or with a fluid and sweeping movement, a performer can create and shape layers of sound around herself. Both the installation and performance will explore the body as a subtle and powerful instrument, providing continuous control of continuous expression. This piece is related to Elena Jessop's doctoral work on new high-level analysis frameworks for recognition and extension of expressive physical performance.