Aerial panoramic view of entrance to scallop-shell shaped bay at Sao Martinho do Porto, Portugal, Europe

Aerial panoramic view of scallop-shell shaped bay at Sao Martinho do Porto, Portugal, Europe

Pod Razor (Ensis siliqua), very obviously razor-shaped shell which is edible and a delicacy in many restaurants, St Abbs, Scotland, UK North Sea

Venus Grotto of King Ludwig II, artificial stalactite cave with a lake and a shell-shaped boat, painting "Tannhäuser bei Frau Venus" by August von Heckel, palace gardens of Linderhof Palace, Upper Bavaria, Bavaria, Germany, Europe

Futuristic shell-shaped artificial Murinsel, Mur Island, with steel dome and footbridges, designed by Vito Acconci, Graz, Styria, Austria, Europe

Table decoration, garden gnome behind two porcelain doves, salt and pepper cellar, on a green, shell-shaped plate, Villa Ambiente, Nuremberg, Middle Franconia, Bavaria, Germany, Europe

Detail of the front, Shell-Haus building, head of the Berlin Gasag natural gas vendor, built in 1932 by architect Fahrenkamp, Berlin, Germany, Europe

Detail of the front, Shell-Haus building, head of the Berlin Gasag natural gas vendor, built in 1932 by architect Fahrenkamp, Berlin, Germany, Europe

Detail of the front, Shell-Haus building, head of the Berlin Gasag natural gas vendor, built in 1932 by architect Fahrenkamp, Berlin, Germany, Europe

Architecture, Universum Science Center Bremen, Germany