Four years later, in 1969, the Exploratorium opened its doors for the first time—an interactive museum of art, science, and human perception based on the philosophy that science should be fun and accessible for people of all ages, set within the north wing of the stately Palace of Fine Arts of San Francisco. Oppenheimer was able to fund the opening of the Exploratorium partly due to a grant from the San Francisco Foundation. The San Francisco Foundation gave a $50,000 grant to Oppenheimer to open the 90,000 square foot facility. Oppenheimer served as the first director of the museum, and was personally involved in almost every aspect of its daily operations for the rest of his life. Frank had also visited the Tel Aviv Science Museum in 1965 and later used several of Ivan Moscovich's designs and exhibits in his revolutionary Exploratorium in San Francisco. There were no admission charges at the Exploratorium for a full twelve years after its opening. The first exhibits in the Exploratorium were constructed with the aid of the Stanford Linear Accelerator Center (SLAC) and the Ames Research Center (NASA).