Is this where the Teletubbies live?

Here’s one more view from the California Academy of Sciences. This is the building’s innovative green roof. The roof is 197,000 square feet of nine native plant species chosen for their ability to survive in the environment. They need no water (although a spray system has been installed in case of severe drought years.)
The living roof is also expected to sustain a variety of life. In fact, a future project is planned that will try to introduce two endangered butterfly species to the habitat.

There's also an amazing view of the De Young from the roof.