Wilkie exploited the full potential of chalk in this masterful drawing of the eminent philosopher Dugald Stewart made in 1824. He is shown seated with one arm resting on an open book, as if he's just interrupted his study to allow the artist to capture his likeness. Stewart was born in Edinburgh and pursued his education here and in Glasgow, where he was inspired by Thomas Reid's teaching of philosophy. Stewart succeeded his father in Edinburgh as professor of mathematics before taking the chair of moral philosophy. He was an outstanding exponent of the philosophy of common sense.