Mr. Egg is an abstract metal sculpture by Tertius Smith, an artist in Wichwood Village, and spends some time on display at the Little Gallery. It features heavily in three chapters of A Job for Susan. When Bill takes a cleaning job at the gallery, Susan, Midge and Tessa pitch in to help him. While cleaning the curious egg-shaped work, Tessa knocks it into a bucket of water. After cleaning it, she puts it back on its pedestal upside down and dresses it up in a raincoat and balaclava and gives it its nickname, incurring the wrath of the offended artist. Mr. Smith then arranges to remove his work from the gallery for repair, but Susan thinks he is a thief and calls the police. The furious Mr. Smith removes all his work from the gallery. The ultimate fate of Mr. Egg is not given, and whether Mr. Smith ever managed to sell it remains a mystery.