Thanks Angelo! Im attaching the original. This is a blowhole where the water is forced into a cave or tunnel underneath the lava rock and the pressure is released in this spouting form. It goes off with each set of waves that come in.
Wonderful colours, Eric. Nice find for the shape. You said you added arms, but I am curious and wonder if you'd consider uploading the original for comparison.
BTW, I hadn't noticed the "added arms" until you mentioned them.