'Behold!' Isaac said, sweeping one arm over his empire of tools and furnaces. This caused the cuff of his robe to fly out from under his smock – catching sight of it, he grasped the smock's sleeve with the other hand and yanked it back to reveal the scarlet raiment of the Lucasian Professor of Mathematics. Coming from any other man this would have seemed dramatic and insufferably pompous, but from Isaac it was the simplest and most concise answer to Daniel's question.