Book excerpt: Hyperbodies are buildings and environments which can continuously change shape and content. The mutations of such buildings depend on the input coming from their user as well as from the surroundings. This interaction between user and building is determined by a data flow which the hyperbody uses and converts into a "hypersurface" structure, which then alters our perception of space in and around the hyperbody. The architect programs this interaction and can thereby define the specific character of the building. In this book, the author provides a concise overview of this latest digital tool. Kaas Oosterhuis is Professor at the Technical University Delft and is a well-known Dutch architect.