The cone shaped funnel in the dome cupola has 360 glass mirrors reflecting light into the Plenary chamber of the Reichstag building, designed by Sir Norman Foster, Berlin, Germany, Europe

Visitors walk up a spiral ramp around the cone shaped funnel in the dome cupola, which has 360 glass mirrors reflecting light into the Plenary chamber of the Reichstag building, designed by Sir Norman Foster, Berlin, Germany, Europe

Close-up of the mantle and siphon of giant clam, Sabah, Malaysia, Borneo, Southeast Asia, Asia

Needle cuttlefish (Sepia aculeata) eye and siphon, Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

Small giant clam (Tridacna maxima), Namu atoll, Marshall Islands, Pacific

Giant fluted clam (Tridacna squamosa), Namu atoll, Marshall Islands, Pacific

Fluted giant clam (Tridacna squamosa), Rongelap, Marshall Islands, Micronesia, Pacific

Small giant clam (Tridacna maxima) surrounded by lobe coral (Porites lutea), Namu atoll, Marshall Islands, Pacific

Giant clam (Tridacna gigas), Rongelap, Marshall Islands, Micronesia, Pacific

Fluted giant clam (Tridacna squamosa), Rongelap, Marshall Islands, Micronesia, Pacific

Sea Squirt Clavelina robusta

Sea Squirt Clavelina robusta. Gili Islands, Lombok, Indonesia

Giant Sea Cucumber Parastichopus californicus

Eye and siphon detail of reef octopus (Octopus cyanea), crawling over reef, Ailuk atoll, Marshall Islands, Pacific

Diver and encrusting sponges and ascidians, St. Peter and St. Paul's rocks, Brazil, South America

Giant clam (Tridacna gigas), Rongelap, Marshall Islands, Micronesia, Pacific

Encrusting sponges and ascidians, St. Peter and St. Paul's rocks, Brazil, South America

Small giant clam (Tridacna maxima) surrounded by lobe coral (Porites lutea), Namu atoll, Marshall Islands, Pacific

Seasquirt Polycarpa aurata

Reef octopus (Octopus cyanea) eye and siphon detail, Rongelap, Marshall Islands, Micronesia, Pacific

Reef octopus, Octopus cyanea, eye and siphon detail, Rongelap, Marshall Islands, Micronesia

Horseshoe clam, Hippopus hippopus, Rongelap, Marshall Islands, Micronesia

Fluted giant clam, Tridacna squamosa, siphon detail, Namu atoll, Marshall Islands (Pacific).

Giant clam, Tridacna gigas, siphon detail, Rongelap, Marshall Islands, Micronesia

Antique siphon bottles, San Telmo Antiques Market, Plaza Dorrego, Buenos Aires, Argentina, South America

Common octopus Octopus vulgaris), mating, male on left inserts mating arm into mantle cavity on female's siphon transfers sperm-filled capsule, Red Sea, Aqaba, Kingdom of Jordan