"Sprocket" is constructed of parts cut from a cottonwood tree removed from the Umlauf Sculpture Garden. The pieces lived as an assembled yard sculpture at my house for a few years. I was trying to make a gear but the wood was rotted in parts and I had to cut a section out. I like the gap. So, it's not a gear. My wife named it "Sprocket" and that fit. "When life gives you lemons..."