"Beadboard!" I say. "Wow. It looks better than I thought."
"Yeah," he says. "I didn't realize it had these random widths. I didn't know you could get that. It's more interesting than the usual kind with narrow intervals."
"You know why?" I ask, realizing that he is missing a crucial piece of information. He looks at me quizzically. "Come on," I urge him. "Let's take a field trip." I turn to go down the stairs and he traipses after me. We don't have far to go.
At the bottom, I turn again, pull out the piece of drywall that has been hovering in the hall for several days. "There," I say. "They copied this wall."