A surgeon in his workroom extracting stones from a patients head; symbolising the expulsion of 'folly' (insanity). Photogravure after J. Steen.

The images of a surgeon (often itinerant) making an incision in a patient's head in order to extract 'stones' (implying madness in the individual) do not represent an actual operation, but are allegorical scenes refering to the subduction of 'folly' (madness) from the body. See further: W. Schupbach, A new look at The cure of folly, Medical history, 1978, vol. 22, pp. 267-281