Immersive design addresses the character, architecture, content, surface and texture of any environment that triggers and drives narrative. Whether that space is proactive or passive, inhabited, or in transition, this cross-media design process uses a multi-dimensional workspace that liberates the creators from traditional linear constraints. How should the new breed of designers establish and understand the complexity of their central role in narrative media? What is this dynamic creative process demanding from new technology? What has changed? What worlds can we now (not) build?