Proceedings of the 28th Annual Conference of the Association for Computer Aided Design in Architecture (ACADIA)This books documents the keynote lectures and papers of the 2008 ACADIA conference in Minneapolis. The book includes papers by over 50 authors as well as introductory essays by 10 leading researchers in the field of design computation. The theme of the conference was "Biological Processes and Computation". The 10 chapters are: 1. Concepts of Nature and Technology Biomimetics 2. Generative Design Strategies for Complex Geometry 3. Differentiated