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Hand-drawn with pen and ink, these wobbly spiral circles flow up and down in a large, seamless pattern. The negative space creates a lovely undulating wave pattern as well. The shapes are remniscent of sea urchins, flowers, bicycle spokes, dandelion seed pods, trees from above (thanks demouse!) and whatever else comes to your imagination.
Darker grey version available here: http://www.spoonflower.com/fabric/2906612