Beyeler Foundation. The Beyeler Foundation or Fondation Beyeler with its museum in Riehen, near Basel, owns and oversees the art collection of Hildy and Ernst Beyeler. Art dealers Ernst Beyeler and Hilda Kunz, known as Hildy, created the Beyeler Foundation in 1982 and commissioned Renzo Piano to design a museum to house their private collection. The collection was first publicly exhibited in its entirety at the Centro de Arte Reina Sofía in Madrid in 1989, and was subsequently shown at Neue Nationalgalerie in Berlin in 1993 and the Art Gallery of New South Wales in Sydney in 1997. By building Renzo Piano's museum structure in 1997, the Beyeler Foundation made its collection permanently accessible to the public. The museum is properly funded, and it receives annual grants from the cantons of Basel City and Basel County and the commune of Riehen.Major partners of the Foundation are Bayer AG, Novartis and Swiss bank UBS. In 2006, approximately 340,000 persons visited the museum. The number of visitors in 2016 was 332,000. The Beyeler Foundation opened its doors on 18 October 1997, presenting 140 works of modern classics, including 23 Picassos. The overall collection of 200 works of classic modernism reflect the views of Hildy and Ernst Beyeler on 20th-century art and highlight features typical of the period from Claude Monet, Paul Cézanne and Vincent van Gogh to Pablo Picasso, Andy Warhol, Roy Lichtenstein and Francis Bacon. The paintings appear alongside some 25 objects of tribal art from Africa, Oceania and Alaska. A third of the exhibition space is reserved for special exhibitions staged to complement the permanent collection. The culmination of Beyeler's career came in 2007 when all the works that passed through his hands were reunited at the museum for a grand exhibition that included van Gogh's 1889 Portrait of Postman Roulin, Lichtenstein's Plus and Minus III and a huge expressive drip painting by Jackson Pollock. The collection is expanding, particularly in terms of works made after 1950. The garden surrounding the museum also periodically serves as a venue for special exhibitions. In a work called Wrapped Trees, Christo and Jeanne-Claude veiled 178 trees in the park around the Beyeler Foundation and in the adjacent Berower Park between 13 November and 14 December 1998. Embedded in the Berowerpark in the Basel suburb of Riehen, the building features a glazed façade largely looking out onto the corn fields and vines covering the Tüllinger Hills. The two perimeter walls of the original garden site inspired the idea of the museum's layout. Four 115-metre-long supporting porphyry walls running from north to south and standing 7m apart define the plan of the building. Resting on top of the solid foundation walls, the lightweight glass roof, white enamelled on the reverse, admits northern light but screens off light from the east and the west. Along the northern and the southern sides the roof projects far beyond the walls, shading the glass façades from the sun. Less than two years after the museum's inauguration in autumn 1997, the building was lengthened by 12 metres. Situated vis-à-vis the museum building, the late-Baroque Villa Berower houses the museum's administration department and a restaurant.