The Utrecht University campus has been turned by OMA from a single-purpose space to a city space, while the existing library with its extension, bar-café and basketball court has become an informal meeting place for students, teachers and athletes by day and night. The site is surrounded by Van Unnik’s 80-metre tower from the ’60s and Koolhaas’s nearby Educatorium from 1997. The library’s height of only 2.6 m has been increased by sinking the external “pool” and the café by 1.2 m. The common ceiling/roof, 70 cm thick and fenced by a 9 m net, is used as a 19 x 21 m court for amateur basketball.