Or a picture of one? Here's a link to give you a general idea: http://www.667shotwell.com/Projects/2004/Itcanchange/install/freeframechris.jpg
These wooden frames were created in San Francisco in the late 1960s by the "Diggers", a group of artists and radicals, including the actor Peter Coyote.
The original "free frame of reference" was a twelve-foot-square free-standing frame painted yellow, through which people were invited to pass.
There were also miniature frames about 2 in X 2 in, which could be worn around the neck. The idea was to get people to think differently about society and politics by giving them a new [metaphorical] frame of reference.
To enlighten you further, here's a link to Coyote's online 'partial history' of the Diggers' activities: http://www.diggers.org/guerrilla_theater.htm
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