Hypobank Building, Munich (Munchen), Bavaria, Germany, Europe

Christmas tree worms (Spirobranchus giganteus) grow on a coral reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

Purple stove-pipe sponge (Aplysina archeri), with boat in background, Curacao.

Christmas tree worms (Spirobranchus giganteus) on brain coral, Saint Croix, U.S. Virgin Islands.

A pair of Christmas tree worms in Cozumel, Mexico.

Multiple christmas tree worms, Curacao.

Christmas Tree Worm in hard coral, Bonaire, Caribbean Netherlands.

A large group of purple tube sponge sits high on the reef, Bonaire, Caribbean Netherlands.The Hilma Hooker Shipwreck is visible in the background.

March 1, 2010 - Sabo channel at Haramatsu River with tubular grid dam (slit dam type), for defense and protection against mudflows, with Sakurajima volcano in background, Japan

Pair of orange and red christmas tree worms on top of yellow hard coral, Pulau Aur, Johor, Malaysia.

The Quiver Tree in Namibia gets its name from the San people who used the tubular branches to form quivers for their arrows, Karas Region, Namibia, Africa

A Quiver Tree gets its name from the San people who used the tubular branches to form quivers for their arrows, near Keetmanshoop, Karas Region, Namibia, Africa

The Quiver Tree gets its name from the San people who used the tubular branches to form quivers for their arrows, Karas Region, Namibia, Africa

Classic tubular shore break surfing wave typical of this region, Playa Hermosa, San Juan del Sur, Rivas Province, Nicaragua, Central America

Foxgloves in a country garden, Swinbrook, Oxfordshire, United Kingdom

Foxgloves in a country garden, Swinbrook, Oxfordshire, United Kingdom

Truck on the Great Western Highway from Sydney to Adelaide, New South Wales, Australia

Colonial corals, euphyllia ancora, has tentacles with tubular tips and are distinctively T shaped

Sunflower (Helianthus annuus) with tubular flowers in heart shape

Cabins running over a high lift support, tubular steel construction, Thale, Harz, Saxony-Anhalt, Germany, Europe

A yawning trumpetfish (Aulostomus chinensis), Hawaii, United States of America