The Menil Collection in Houston, Texas houses the private art collection of John de Menil and Dominique de Menil. Renzo Piano designed the museum building in 1987 to hold the collection of over 15,000 works of twentieth-century art. Piano's understated design blends into the surrounding residential neighborhood with a facade of gray siding and steel. The museum allows natural light into galleries while protecting works of art, using a wave-shaped roof and ceiling structure inspired by sailboats. The campus has expanded over time and the neighborhood maintains a coordinated aesthetic.