Yasaka no to, Hokanji, Kyoto (Japan)

This is a beautiful postcard of Kyoto, Japan, even though the sender lives in Gunma Prefecture. I don’t know a lot about Japanese geography, but I had never heard of Gunma Prefecture before, nor its important cities: Maebashi (capital) and Takasaki (largest city). I love this night scene, and I’m curious about the red trail that was left through. Is it a bicycle light?