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The most challenging part of Heer's production process is stuffing the mattress — it's much like sculpting, in that it takes years of practice to be able to instinctively feel when you're achieving the right form. Heer takes one full day to stuff each mattress, building up the horsehair in three layers. "When I did the workshop here with my father, he said I was too slow," he says. "His father used a pitchfork because there wasn’t enough time. For me it's very meditative work."