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It is a precision drawing, first drafted and then colored in. A geometric structure so it is spatially algorithmic - if I remember correctly, it was a trisected line with an extension at 30 degrees and a self similar grid can be obtained. This happens to be one instance of a possible tiling of the space. If you note, this panel has (discounting the border black blocks which would extend way out into a much larger surface) 3 degrees of recursion. The middle rectangle is identical to the overall image and also contains a tiny image of itself.
I looks a bit like the Golden Spiral. I like it. http://en.wikipedia.org/wiki/Golden_spiral