That dramatic double-sphere silhouette, with its tight central pinch and two full swelling chambers, now in plant-based plastic with a bevelled contact edge. Because only the chamfered face touches the spinning wall, the deep concave curve transfers cleanly into the clay without the rib catching or chattering on the way in. Press it firmly against the outer wall and the form does itself in a single confident pull. Perfect for decorative vases and sake bottles where volume and drama are the whole point. Two bubbles, one motion, even less guesswork.