The Professor is described in the first book as having, like all great men, simple tastes: "His coat was simply fastened with safety pins because the buttons had simply fallen off. His head was simply bald and it simply shone like anything when the sun caught it." He has five pairs of spectacles – one for reading, one for writing, one for out of doors, one for looking at you over the top of and a fifth pair for looking for the others on the frequent occasions when they get lost. Other pairs of spectacles are often mentioned.