Dubbed Ao no Dokutsu ('Blue Cavern'), this year's illumination show along the Meguro River engulfs the area in a mysterious glow from November 23 to Christmas Day. Set up over a 1km stretch by the river close to Nakameguro Station, thousands of blue LEDs reflect off the water's surface to create an immersive light-up experience.
Update: Due to extreme crowding around the area, the light-up will be turned off on weekends and holidays (Dec 13, 14, 20, 21, 23).