One of the hand-built wooden platforms, part of an event called the Ephemerisle Festival, floats along the Sacramento River delta. The festival is designed to give would-be "seasteaders" a chance to learn what kind of designs and social structures might work in future settlements on the high seas.
Volunteers at the Ephemerisle Festival lash together floating platforms on the Sacramento Delta to learn about living on the water. Eight houseboats, which would later be connected to the main platform, are in the distance.
Like the Burning Man festival in Nevada a month earlier, the Ephemerisle Festival featured art projects, including these giant floating lilies that were illuminated at night.
Two attendees at the Seasteading Institute's festival test out a floating swing, which swayed too much in the current to be very useful.
The main platform at the Ephemerisle Festival on the afternoon of October 3, complete with pirate flag and a lookout perch. In the next few years, the organizers hope to move the festival to the San Francisco bay and then to the Pacific Ocean.