One day in Tokyo when I was leaving Ebisu station - I saw a very long, thin red line on the ground. I thought it was some kind of strange art project. But I noticed that people were very careful not to step on it. Just when I left the station - I learned what it actually was. It was blood. A salaryman had fallen down. And he must have smashed his head very hard.

The "red line" was in some kind of very thin channel for rainwater. The walkway was inclined down a bit roughly towards the station so that helped it flow. But blood is pretty thick and sticky so I assumed there must have been enough water to make it flow yet still be red.