Cosm is an integrated collection of extensions to Max/MSP/Jitter to assist the construction of navigable, sonified, complex virtual worlds, and has been designed to facilitate use in CAVE-like environments. Cosm adds support for six degrees of freedom navigation for both camera and world-objects, collision detection between objects (based on spherical intersection), spatialized audio for mobile objects. It also provides rich support for 3D fields as dynamic environments, and agent-environment interactions.