NEW YORK CITY — “The monumental palaces and the busy traffic of the grand canal are bit players in this composition,” explains Christopher Apostle, head of the Old Masters department at Sotheby’s, “here we see real Venetians.” Marieschi’s view of the Cannaregio foregoes the romanticism of wealth in favor of the lives of the people: selling fish, loading boats and chatting with neighbors, all within a working class neighborhood and the Jewish ghetto. The painting will be a part of their evening sale January 25. For more information, www.sothebys.com.