Invader rue de Rivoli by Invader

Invader (born 1969) is a street artist who pastes up characters from and inspired by the Space Invaders game, made up of small coloured square tiles. He does this in cities across the world, then documents this as an "Invasion", with maps of where to find each invader.

He started this project in 1998 with the invasion of Paris - the city where he lives and the most invaded city for now - and then spread the invasion to 35 other cities in the world. Los Angeles, New York City, London, Manchester, Newcastle, Geneva, Tokyo, Melbourne, Vienna, Bilbao, Bangkok, Darlington and even Mombasa are now invaded with his colourful characters in mosaic tiles.

Wikipedia

See also http://virtualglobetrotting.com/map/52482/