David Wills shot this photo in San Francisco. He says they are typically on either side of Muni bus stops.
Maybe they lead to spacious underground living quarters (for very small people).
About Lloyd Kahn
Lloyd Kahn started building his own home in the early '60s and went on to publish books showing homeowners how they could build their own homes with their own hands. He got his start in publishing by working as the shelter editor of the
Whole Earth Catalog with Stewart Brand in the late '60s. He has since authored six highly-graphic books on homemade building, all of which are interrelated. The books, "The Shelter Library Of Building Books," include
Shelter,
Shelter II (1978),
Home Work (2004),
Builders of the Pacific Coast (2008),
Tiny Homes (2012), and
Tiny Homes on the Move (2014). Lloyd operates from Northern California studio built of recycled lumber, set in the midst of a vegetable garden, and hooked into the world via five Mac computers. You can check out videos (one with over 450,000 views) on Lloyd by doing a search on YouTube:
I understand that every person has the passion in any aspects or things. If you love something and it came in front of you it completes your day and your mood turns into something you won't expected. I love your work and I want to read more about it. Visit my site if you have time . Thank you.
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http://www.triciajoy.com