This piece is a sketch left for him by his friend, the Japanese artist Shin Tanaka, famous for making paper robots you print out and assemble yourself. "His fiancé is also an artist, and she did the drawing on the left while he did the one on the right," he says. "They visited New York in March and came to the studio, and in Japan it’s customary if you’re an artist to draw something to leave behind — it's like a signature. I did one for them as well."