Spatial Cognition 2006: Poster Presentations University of Bremen, Germany, September 2006 Thomas Barkowsky, Christian Freksa, Markus Knauff, Bernd Krieg-Brückner, Bernhard Nebel (Eds.) SFB/TR 8 Report No. 011-09/2006 Report Series of the Transregional Collaborative Research Center SFB/TR 8 Spatial Cognition Universität Bremen / Universität Freiburg