André Prager turns away from me for a moment, rummaging through a pile of stuff on the cart he has pulled into the small conference room. There are lots of cut-up pieces of cardboard, with a few bags of colorful plastic odds and ends mixed in. “I think the most valuable things in this building are cardboard and tape,” he says. He shows me a rectangle of foam-core with a straw, a broken pen, and a few thumb tacks stuck to it.

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