New methods for simulating the form of buildings using virtual reality (VR) have suddenly made it possible to link ways in which people use buildings to their geometric layout. VR opens up many different approaches to architectural simulation ranging from agent-based modelling of movement within a building to representing a building as a multi-user world.

We demonstrate some of these possibilities using the Tate Gallery on London's Millbank where we predict the impact of detailed changes on the configuration of rooms and the display of pictures.