The psychedelic illumination is the work of Japanese digital artist Akira Hasegawa. Over the past few years, with his project Digital Kakejiku (D-K), Hasegawa has been similarly illuminating various large buildings in Japan and around the world.
Digital Kakejiku is a technique of projecting random slow-moving sequences of abstract patterns on large areas of building surfaces. At a glance, the patterns look still, but when you look away for a minute, the image is completely transformed.
Sixty projectors were used to illuminate the Tokyo City Hall building.