This painting was SO fun to do. And also incredibly difficult; I could feel my brain cells burning up as I worked. It's only 5 inches square, but still took me two sessions. It's part of the Daily Paintworks weekly challenge: you can see the description here.
As always, I got in too tight, but it was amazing how many different colors and values I began to see as I studied it. I limited myself to only horizontal and vertical rectangles, which I don't think was part of the original challenge, but it was a good experience to do it that way.
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