Listening to a podcast from Your Call, interview with Nina Simon, Executive Director at the Santa Cruz Museum of Art & History: she describes their policy of "spontaneous free" -- If someone is looking around, hesitating, not reaching for their wallet, we'll go up to them and invent a reason to invite them in--"Oh, it's your first time here? It's free for you. You're an artist? It's free for you today." Makes me think of the Diggers' 1% Free..