A few years ago I participated in a project called “Bare Witness for Peace”, a movement whereby activists gathered together and created peace messages with our unclothed bodies. See the Utah Photo
Looks like a similar, albeit clothed, concept has been organized: Beach Impeach
Volunteers gather to form 100-foot letters stretching 450 feet across the sand on Ocean Beach in San Francisco on Saturday to spell the word “impeach” for the benefit of aerial travelers. The Beach Impeach Project was organized by activist Brad Newsham. Beach Impeach Project photo by John Montgomery
Dee's 'Dotes~Anecdotes of a Green Activist 
I was there
I’ve got pics from the ground here.
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