Dr. Montoya seemed to be unaware of anyone else in the room as he went to the blackboard and picked up an eraser to wipe out a large block of neatly written words. The line of text above him, at the top of the blackboard read, “First, do no harm...” “Now, you see,” Dr. Montoya said as he began a sketch on the blackboard, “here you have the upper section of the prosthesis.” He drew quickly, with simple strokes, but also with great artistic clarity. “And the lower part of the limb is here, then the foot.” The entire picture emerged within half a minute. Raji and I looked around at the students. They were absolutely quiet, with their attention riveted on Dr. Montoya’s sketching. Several were taking notes and apparently duplicating the drawing from the board. I glanced at Raji, who was just

