Artist Doug Aitken's multi-screen installation, Altered Earth, is a moving-image earthwork installed in La Grande Halle for the Parc des Ateliers in Arles, France in 2012.
This film documents a one-time musical "Happening" staged inside Aitken's Altered Earth installation in collaboration with Terry Riley. Riley's improvisation took place in 4 separate musical parts within the art installation.
This film documents 4 minutes of Riley's 50 minute performance.