Shibuya Ao no Dokutsu
Time Out says
Dubbed Ao no Dokutsu ('Blue Cavern'), this illumination show was a huge hit when it first took place along the Meguro River back in 2014. Brought back to Shibuya a couple of years ago, it will again engulf the backstreets of Shibuya in a mysterious glow until New Year's Eve. Set up along a 800m stretch covering Koen-dori all the way to Yoyogi Park, thousands of blue LEDs reflect off the ground to create an immersive light-up experience.