He's one of France's best known street artists, leaving a trail of Space Invaders across the world. "Invader", whose mosaic-style UFO-chic art pieces have left their mark on cities from Tokyo to Katmandu, is returning to his home town of Paris this summer to inaugurate his one-thousandth extra-terrestrial -- and to announce his newest project, dubbed "Rubik's cubism". Duration: 02:02