Alex Mustard / Grooved brain coral (Diploria labyrinthiformis) at night with polyps extended to feed, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Chien Lee / Mushroom (Filoboletus manipularis) group glowing at night, Danum Valley Field Center, Sabah, Borneo, Malaysia

Floris van Breugel / Various fluorescent minerals : 1Willemite, New Jersey, 2: Willemite and Calcite, New Jersey, 3: Fluorite, Ohio, 4: Willemite and Calcite, New Jersey. 5: Fluorite, California. 6: Scheelite, California....

Alex Mustard,Alex Mustard / A blue light fluorescence photo of Jewel anemones (Corynactis viridis). The blue light source excites the fluorescent pigments in the anemones, which emit light of other colours. The muddy seabed and...

Juergen Freund / Fluorescent corals (Trachyphyllia geoffroyi) Great Barrier Reef, Australia

Juergen Freund / Fluorescent corals (Favia sp) Great Barrier Reef, Australia

Alex Mustard / 2020VISION / Devonshire cup coral (Caryophyllia smithii) photographed under deep blue light to reveal its fluorescent pigments, showing up as green in this photo. Plymouth Sound, Devon, UK, English Channel, July

Nick Turner / Man lifting fluorescent light tubes at a recycling centre, Stroud, Gloucestershire, UK, February 2008.

Alex Mustard / Brain coral (Pseudodiploria strigosa) photographed under blue light to excite the fluorescence, Little Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Doug Perrine / Flower Hat Jelly / Jellyfish (Olindias formosa), a rare hydromedusa with fluorescent tentacle tips. Endemic to Brazil, Argentina, and southern Japan.

Juergen Freund / Fluorescent corals. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Fluorescent corals, Misool, Raja Ampat, West Papua, Indonesia