 An early example of this is the Observation Tower at Helsinki Zoo (2002) by Ville Hara and the Wood Studio.Similarly, Kärsämäki Shingle Church (1999–2004) by Anssi Lassila, was the result of a student competition held by the University of Oulu Department of Architecture, based on the idea of a modern church built using 18th century timber construction techniques, as a reminder of a previous church on the same site.Other notable large-scale wooden constructions since 2000 include the Sibelius Concert Hall, Lahti (1997–2000), by APRT; the east stand roof of the Helsinki Olympic Stadium (2005) by K2S Architects; and Kilden Performing Arts Centre, Kristiansand, Norway (2012) and Helsinki Main Library Oodi (2018) both by ALA Architects.