 Architect Renzo Piano constructed the Zentrum Paul Klee in June 2005.Located in Bern, the museum exhibits about 150 (of 4000 Klee works overall) in a six-month rotation, as it is impossible to show all of his works at once.Furthermore, his pictures require rest periods; they contain relatively photosensitive colors, inks and papers, which may bleach, change, turn brown and become brittle if exposed to light for too long.