Klee made over 10,000 paintings, drawings, and etchings in his lifetime. His works are held in museums all over the world. In 2005, the Zentrum Paul Klee (Paul Klee Center) was opened in Bern. The building was designed by the Italian architect Renzo Piano. It holds 4000 works by Klee and shows 150 at time. The exhibition changes every six months.