Deserted Wharf (The Old Mill at Cos Cob), c.1900-1902. In 1892, John Twachtman, one of the most imaginative of the American Impressionists, established a summer colony at Cos Cob, Connecticut. This painting depicts the Holley Mill near Cos Cob. Unlike the French Impressionists, who tended to analyze the effects of light and colour in a scene, Twachtman was interested in expressing the pure poetry of colour and his emotional response to the changes he observed in nature.