The Probity of Modernism: Collages by John Chamberlain and Alfred Leslie » detail of John Chamberlain, Untitled, ca.1960. Painted paper, staples, and mixed media on collage board, 11-1/2 x 11-1/2 inches. Courtesy of Allan Stone Gallery

detail of John Chamberlain, Untitled, ca.1960. Painted paper, staples, and mixed media on collage board, 11-1/2 x 11-1/2 inches. Courtesy of Allan Stone Gallery

detail of John Chamberlain, Untitled, ca.1960. Painted paper, staples, and mixed media on collage board, 11-1/2 x 11-1/2 inches. Courtesy of Allan Stone Gallery