Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Shore of the Emerald Lake, natural vibrant colour gradient with view on the Red Crater Volcano of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Beautiful puruple sunrise colour gradient spread across mountain chains, including Dorje Lakpa, Himalayas, Nepal, Asia

San Francisco Cable Car stops to allow passengers to board, California, United States of America

Baldwin Street, the world's steepest residential road with an average gradient of 1 in 5 and 350 metres long, Dunedin, Otago, South Island, New Zealand, Pacific

Tourists at Baldwin Street, the world's steepest residential road with an average gradient of 1 in 5 and 350 metres long, Dunedin, Otago, South Island, New Zealand, Pacific

San Francisco Cable Car, California, United States of America

Logo of the Bayer AG, a German chemical and pharmaceutical company

Gradient of colors in a beautiful sunset from a top of a mountain

Facade, modern office building Cologne Oval Offices, Gustav-Heinemann-Ufer, Bayenthal district, Cologne, North Rhine-Westphalia, Germany, Europe

Facade, modern office building Cologne Oval Offices, Gustav-Heinemann-Ufer, Bayenthal district, Cologne, North Rhine-Westphalia, Germany, Europe

Facade, modern office building Cologne Oval Offices, Gustav-Heinemann-Ufer, Bayenthal district, Cologne, North Rhine-Westphalia, Germany, Europe

A single person on the beach, Playa de Las Teresitas, San Andres, Santa Cruz de Tenerife, Tenerife, Spain, Europe

Scuba diver under ice in a halocline cloud, a subtype of chemocline caused by a strong, vertical salinity gradient within a body of water. Arctic circle Dive Center, White Sea, Karelia, northern Russia