floors in the foyers and wet spaces. Exterior walls are covered with stone or stucco. Collection and exhibitions The museum opened with a proposal of works for the collection, most of which were bought in the subsequent years. Since 2003, the library has featured Mario Pedrosa (2003), a site-specific ceiling installation composed of 77 manufactured glass globes by Tobias Rehberger. Today, the collection is constituted by direct acquisitions by the museum, works deposited by the State and private collectors and also donations. From the beginning, the collection and the various exhibitions have focussed on the period following 1968. There are no permanent exhibitions, but the museum hosts five exhibits from invited artists every year. In recent years, the museum has organized exhibitions by Alvaro Lapa, Jorge Pinheiro, Franz West, Roni Horn, Claes Oldenburg and Coosje van Bruggen, Richard Hamilton, Christopher Wool, Luc Tuymans, Monir Shahroudy Farmanfarmaian, Ana Jotta. Serralves shares exhibition costs with the likes of the Whitney Museum of American Art, the Whitechapel Gallery or Museum Ludwig, among others. The symbolic start date for the collection is 1968, but it refers specifically to the socio-cultural events of the second half of the 1960s which, in addition to the consecration of pop art, witnessed the launch of the bases of dematerialisation of artworks, the mingling of formal genres, the use of film, photography and text to underpin conceptual projects and blurring of the lines between art and life, accompanied by widespread agitation for new political and social ideas. In Portugal, the late 1960s paved the way for the experimentalism of the 1970s and the beginning of a dialogue that was more informed by international experiences and relationships between Portuguese artists and their foreign counterparts. Directors The first director was Vicente Todolí (born in Valencia, Spain, in 1958). After his position as Chief Curator (1986–88) and then artistic director of IVAM (Instituto Valenciano de Arte Moderno) 1988–96, he joined the Museu Serralves as its founding Director in 1996, participating in Siza's new building project for the Contemporary Art Museum, inaugurated in 1999. His last project at Serralves was the first Francis Bacon exhibition in Portugal, "Caged-Uncaged". In 2003, Vicente Todolí was appointed Director of the Tate Modern in London and João Fernandes, who had been with the museum since its opening in 1999, succeeded him as director until 2013. Under Fernandes, exhibitions at the Serralves included "Robert Rauschenberg: Travelling '70–'76" (2008)