Fig. 80: Macro image of a sea urching. The round thing is not the eye. It's the butthole. Some sea urchins have light sensitive cells on their skin so they can distinguish between light and shadow. Dive #362: Sabang Laguna, Mindoro Island, Philippines — EXIF: Nikon D200; Δt=1/250 s; f=105 mm; f/16.0; ISO 100; 2009-11-12 7:57:14
