light on in his room and peek in the crack of the door. ed would be sitting cross-legged on the ground with his back to her, an array on the ground in front of him, drawn in chalk. sometimes he would still be staring at it when she left quietly, sometimes he would reach out with his human and and wipe away the lines.
when she asked, he would shake his head and smile. and say it was just a part of the principle of equivalent trade. 