Here's my second attempt at a realistic sea urchin (our most common species for Uni here),in forged and welded stainless steel. I've embellished the natural pentagonal symmetry of the little nubbins by variegating the buffing pattern and leaving the heat patina for color...
4 inch diameter.
It was an interesting fabrication. I used two identical discs and formed them with dies on my 20 to frame press to the appropriate shapes for the top and bottom half of this most remarkable creature.Two mating convex forms welded all the way around the equator ,then ground and polished so the seam disappears.
SOLD Jan 29,2011