David Klein has a forest cottage in the San Francisco Bay Area in California, nestled in the Santa Cruz Mountains southwest of San Jose, close to Redwood National Park. Although David owns homes in various countries around the world, he seldom refers to any of them as "my home"—but this one does count.
The back door of "David's House" leads directly into the redwood forest of Santa Cruz. David and his two teenage sons spent half of a summer building a pebble path here—the pebbles were transported by hired hands for a small fee, and the construction machinery was designed by Xiang Shan in half an hour and was built locally using additive manufacturing. Later, this part of their work was made into a video and uploaded to the internet to showcase Xiang Shan's concept of an "All-Purpose Industrial Mother Machine" in everyday scenarios.
