This is just what I have thought when I have seen slaves at work - they seem to go through the motions of labor without putting strength into them. They keep their powers in reserve for their own use at night, perhaps.

Olmsted and Vaux continued their informal partnership to design Prospect Park in Brooklyn from 1865 to 1873. Olmsted was a frequent collaborator with architect Henry Hobson Richardson for whom he devised the landscaping schemes for half a dozen projects including Richardson's commission for the Buffalo State Asylum. The firm lasted until 1980.

Frederick Law Olmsted (April 26 1822 – August 28 1903) was an American journalist social critic public administrator and landscape designer. In Chicago his projects include: Marquette Park; Jackson Park; Washington Park; the Midway Plaisance for the 1893 World's Columbian Exposition; the south portion of Chicago's "emerald necklace" boulevard ring; Cadwalader Park in Trenton New Jersey; and the University of Chicago campus. Olmsted was famous for co-designing many well-known urban parks with his senior partner Calvert Vaux including Central Park and Prospect Park in New York City.