I'm a sucker for color theory/color wheel exercises of all sorts, but come across them less and less often these days, so I'm even more inclined to grab them when I do. I love the three-dimensionality of this one, making it feel like a field of colorful flags waving in the breeze (or a mock up for an installation, a la Christo and Jeanne-Claude's golden Gates, but in a rainbow spectrum!) Signed Jonson in pencil at lower right, and then again Lennart Johnson on reverse. 

12 1/8" x 9" and in good vintage condition, with all color strips well attached.