Some corals contain fluorescent molecules, proteins in their tissue that absorb light from an external source and emit light back at different wavelengths. Marine biologist David Gruber uses a painstaking method of underwater photography to get striking images of fluorescent corals, including images of moon coral and staghorn coral.
Extreme close up focused on just the feet. The effect of this shot changes in reference to what is being filmed and the context around the scene! However, it is always dramatic and a great perspective changer.