The Museum of Fine Arts, Houston usually has a strict no-touch policy. But for "Soto: The Houston Penetrable," a kinetic installation by the late Venezuelan artist Jesús Rafael Soto, touching was not only encouraged, it was required. Made up of 24,000 plastic tubes that had been hand-painted and hung from the ceiling, the installation was not considered complete until viewers entered and moved through the tubes. "The Houston Penetrable" was commissioned by MFAH some ten years ago, and after Soto's death in 2005, work on the project continued under the supervision of Paolo Carrozzino and Walter Pellevoisin. Workers in France and Houston hand-painted the tubes and hand-tied the knots to construct the installation, while thousands of Houstonians spent five months wading through those tubes to help complete the artist's vision.