Floris van Breugel / Glass beach at sunset - a former dump site, in which the glass has now become pebbles of sea glass. MacKerricher State Park. California. USA. January 2013

Michael Pitts / Mike de Gruy, underwater camerman, in Remora submersible, Mediterranean

David Shale / Male and Female glass shrimps on Glass sponge (Hexactinellida) from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

Juergen Freund / Mermaid's wineglass algae (Acetabularia calyculus) Batangas, Philippines.

Steven Kazlowski / Polar bear (Ursus maritimus) looking through window of a tundra buggy, with paws against the glass, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska, October 2005

Steven Kazlowski / Polar bear (Ursus maritimus) trying to bite window of a tundra buggy, with paws against the glass, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska, October 2005

David Shale / Glass squid {Teuthowenia megalops}, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Piglet squid {Helicocranchia sp} from between 500 and 200m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Deep sea Glass squid {Cranchia sp} from Mid-Atlantic Ridge

Doug Perrine / Paralarva of Glass squid (Leachia pacifica) in surface waters of deep open ocean at night, Kona, Hawaii, Pacific Ocean.

Doug Perrine / Paralarva of Glass squid (Leachia pacifica) in surface waters of deep open ocean at night, Kona, Hawaii, Pacific Ocean.

David Hall / Glasseye Snapper (Heteropriacanthus cruentatus) sheltering among sponges including yellow Convoluted barrel sponges (Aplysina lacunosa) and Gorgonian Sea Plumes (Pseudopterogorgia sp.), silhouetted ag...

Franco Banfi / Glass shrimp / Cleaner shrimp (Periclimenes scriptus) commensal with Sand anemone (Condylactis aurantiaca) Vis Island, Croatia, Adriatic Sea, Mediterranean.

Pascal Kobeh / Great barracuda (Sphyraena barracuda) on the reef with Jackfish (Caranx latus) and surrounded by Masked gobies (Coryphopterus personatus) or Glass gobies (Coryphopterus hyalinus), The Gardens of the Q...

Claudio Contreras / Glass goby (Coryphopterus hyalinus) Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico, Vulnerable.

Sirachai Arunrugstichai / Black-banded demoiselle (Amblypomacentrus breviceps) peeking out from a algae-covered glass bottle on the sea floor, Lembeh Strait, North Sulawesi, Indonesia.

Claudio Contreras / Glass goby (Coryphopterus hyalinus), Guanahacabibes Peninsula National Park, Pinar del Rio Province, western Cuba.

Alex Mustard / Close up photo of a Glass goby (Coryphopterus hyalinus) on a coral reef. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Ashley Cooper / Lighthouse on Lundy Island, Devon, England, UK, June 2006.

Franco Banfi / Commensal / Glass anemone shrimp (Periclimenes brevicarpalis) on Sea anemone, Pura Vida House Reef, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.

Ashley Cooper / Campbell Stokes Sunshine Recorder, which measures hours of sunlight at Base Orcadas, an Argentine scientific station in Laurie Island, South Orkney Islands, Antarctic Peninsula.

Alex Mustard / Veined octopus (Amphioctopus marginatus) in den in a discarded glass jar. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Tony Wu / Small octopus (Octopus sp) peering out of a discarded glass bottle in the muck of Lembeh Strait in North Sulawesi, Indonesia

Solvin Zankl / Juvenile glass squid (Bathothauma lyromma) deep sea species from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Squid (Liocranchia reinhardtii) deep sea species from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Juvenile Squid (Liocranchia reinhardtii) Deep sea species from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Juvenile Squid (Leachia atlantica) deep sea species from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Juvenile deep water pelagic octopus (Vitreledonella richardi) semi-translucent species, from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Squid (Cranchia scabra) deep sea species from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Juvenile Squid (Liocranchia reinhardtii) deep sea species from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Squid (Liocranchia reinhardtii) Atlantic Ocean off Cape Verde. | Atlantischer Ozean, nahe Kap Verde Captive.

Solvin Zankl / Glass octopus (Vitreledonella richardi). deep sea species from Atlantic Ocean off Cape Verde. Captive.

Doug Perrine / Hawaiian monk seal (Neomonachus schauinslandi) female and pup aged 6 weeks resting on beach. This shoreline is known locally as 'Trash Beach' because marine debris continually washes ashore here, bits...

Doug Perrine / Hawaiian monk seal (Neomonachus schauinslandi) female and pup aged 6 weeks on beach. This shoreline is known locally as 'Trash Beach' because marine debris continually washes ashore here, bits of plas...

Richard Robinson / A diver inspects a crystal glass on the Wreck of the Waikare, a steel screw steamer that sank in 1910 at Stop Island, Dusky Sound, Fiordland National Park, New Zealand.

Sam Hobson / Bananaquit (Coereba flaveola) drinking fruit juice from glass on hotel balcony. Stonehaven Bay, Tobago, Trinidad and Tobago.

Franco Banfi / Tasselled Wobbegong (Eucrossorhinus dasypogon) with Starry puffer fish, (Arothron stellatus) and Glass fish (Ambassidae) under a coral, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Juergen Freund / Indonesian wobbegong (Orectolobus leptolineatus) with Glassy Sweeper Glass fish (Pempheris schomburgki) Raja Ampat, West Papua, Indonesia

Gavin Hellier / Cathedral of the Assumption of the Virgin, built between 1880 and 1886 is the main symbol of the city with it's gold domes and stained glass windows, illuminated at dusk, Varna, Black Sea Coast, Bulga...

Gavin Hellier / Cathedral of the Assumption of the Virgin, built between 1880 and 1886 is the main symbol of the city with it's gold domes and stained glass windows, Varna, the chief city of the Black Sea, Bulgaria,...

David Shale / Glass sponge (Hexactinellida) with Glass shrimps visible inside, from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

David Shale / Male and female Glass shrimps on Glass sponge (Hexactinellida) from coral seamount, SW Indian Ocean, Atlantis Bank, depth around 700m, December 2011

David Shale / Male and female Glass shrimps on Glass sponge (Hexactinellida) from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

David Shale / Gravid female Glass shrimp from glass sponge, from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

David Shale / Gravid female Glass / Ghost shrimp on Glass sponge (Hexactinellida) from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

David Shale / Glass sponge (Hexactinellida) view through mesh of ostium to glass / ghost shrimps inside, from coral seamount, SW Indian Ridge, Indian Ocean, December 2011