A building like a park. The floor of the new library building at the University in Lausanne curves up and down, it forms hills and hollows. In between there are glazed atria which open up the view to the sky and let in daylight everywhere. The Japanese team of architects SANAA designed this unusual building and, as with all of its buildings, visually dissolved the spatial partitions as far as possible. It is a spatial experiment, in which the functional areas are not defined by room walls, but by the topography; a spatial experiment that probably also influenced the decision of the jury to award this year's Pritzker Prize to the two owners of the SANAA consultancy, Kazuyo Sejima and Ryue Nishizawa.