Fog sweeps in over Twin Peaks in San Francisco.

Some kind of epiphyte hanging out on a tree in the Presidio of San Francisco.

Photo of steam from the Watercress Line over the British countryside.

Photo of a moth taken with a Lytro light field camera.

Photos of the USS Hornet taken with a Lytro light field camera.

Photo of downtown San Francisco under a lot of clouds taken from Alameda.

From The Museum of Mathematics at Discovery Days (AT&T Park).

Playing with Lytro (light field camera). A tree in Bernal Heights Park, San Francisco.

Photo of a setting full moon early in the morning next to Sutro Tower in San Francisco.

Panoramic photo of the Golden Gate, taken from Baker Beach in San Francisco.