In the early part of last century a set of illustrations to Faust by Retzch used to be greatly admired; about one of them, a picture of Faust and Margaret in the arbour, Shelley says in a letter to a friend: "The artist makes one envy his happiness that he can sketch such things with calmness, which I only dared look upon once, and which made my brain swim round only to touch the leaf on the opposite side of which I knew that it was figured."