From Wikipedia: "Space Invaders (スペースインベーダー Supēsu Inbēdā) is an arcade video game developed by Tomohiro Nishikado and released in 1978. It was originally manufactured and sold by Taito in Japan, and was later licensed for production in the United States by the Midway division of Bally. Space Invaders is one of the earliest shooting games and the aim is to defeat waves of aliens with a laser cannon to earn as many points as possible."
From Wikipedia: "Invader is the pseudonym of a French urban artist, born in 1969, who pastes characters from and inspired by the 1978 arcade game Space Invaders, that are composed of small colored square tiles forming a space invader character mural mosaic. He does this in cities across the world, then documents this as an "Invasion", with books and maps of where to find each invader. His website was started in 2008."