Architectural Record (via MacRumors) has published an interview with architect Norman Foster, which includes two questions about Apple’s future spaceship campus:

So what made the form of a ring the logical choice for this building?

It’s interesting how it evolved. First of all, there was a smaller site. Then, as the project developed, and the Hewlett-Packard site became available, the scale of the project changed.

Meanwhile, the reference point for Steve [Jobs] was always the large space on the Stanford campus—the Main Quad—which Steve knew intimately. Also, he would reminisce about the time when he was young, and California was still the fruit bowl of the United States. It was still orchards.

Demolition of existing structures at the location of future Apple Campus 2 is well underway after the company received final approval from the Cupertino City Council in November.