In Untitled [8/71] 1971 (T12243), painted in the year before he produced T12239, the lines of the grid traverse the entire canvas with horizontal
yellow stripes imposed over vertical black ones.
However, in Untitled [8/71], painted nine years later, the lines of the grid traverse the entire canvas, and the horizontal
stripes (in
yellow) are
imposed over the vertical ones (in black).