Group of four grotesque chimneys on the roof of La Pedrera (Casa Mila), and roof window details on an apartment block designed by Antonio Gaudi, UNESCO World Heritage Site, Passeig de Gracia, Barcelona, Catalunya, Spain, Europe

A block street party known as bloco ahead of 2024 Carnival in Leblon, Rio de Janeiro, Brazil, South America

The Block of Discord on Passeig de Gracia includes Casa Amatller, designed by Puig i Cadafalch, and Casa Battlo, by Gaudi, Eixample neighborhood, Barcelona, Catalonia, Spain, Europe

Essar House new high rise office development for Essar Group in Mahalaxmi area of Mumbai, India, sign of thriving Indian economy

Essar House new high rise office development for Essar Group in Mahalaxmi area of Mumbai, India, sign of thriving Indian economy

The Block Arcade, corner Collins Street and Elizabeth, Melbourne, Victoria, Australia, Pacific

Street paved in a cobblestone fashion, the main ancient city street with stepping stones, raised blocks and houses, Pompeii, UNESCO World Heritage Site, Campania, Italy, Europe

Post horn, logotype at the Post Tower Bonn, NRW, Germany,

ThyssenKrupp high-rise, Duesseldorf, NRW, Germany

RWE company sign in front of the RWE Tower, called Power Tower, the headquarters of Germanys biggest electricity supplier, Essen, NRW, Germany

Post Tower, Bonn, NRW, Germany,

Board with company logos in front of the Post Tower, Bonn, NRW, Germany,

Office building GAP 15, Duesseldorf, NRW, Germany

Mannesmann high-rise, today vodafone, Duesseldorf, NRW, Germany

Coral reef, reef block overgrown with Klunzinger's Soft Corals (Dendronephthya klunzingeri) and various stone corals (Hexacorallia), swarm Anthias (Anthiinae), Red Sea, Egypt, Africa

Diver, huge coral block from different stony corals (Scleractinia), swarm Anthias (Anthiinae) Red Sea, Egypt, Africa

Colourful blocks stacked into a tower and dispersed on the floor at playtime; Surrey, British Columbia, Canada

Belugas (Delphinapterus leucas) moving between blocks of broken pack ice, Svalbard, Arctic.

Yellow-legged Gull (Larus michahellis) in flight in the Mediterranean, off the coast of La Grande Motte, France

Whooper swan (Cygnus cygnus) on water at sunrise, Sanmenxia, Henan ptovince, China