Pictured above: Sol LeWitt, Wall Drawing #356 BB Isometric figure within which are 3" wide black lines in three directions. (Cube without a cube), 2003.
Across the room from #356 is a study in color that had me fascinated, #1113 (above). Appeals to my Ikebana and quilting sensibility. See it through this videographer below.
Check out Variations Of Incomplete Open Cubes.
How many lines does it take to suggest/represent a cube?