This is a bit of an update on the theme of natural spaces. One f the questions pondered this week whether groups like the Rubik cube are natural. The drone pictures were taken the same day too. I flew to the river to peek at the Head of the Charles Regatta. A few seconds can be seen at the beginning and the end. I still want to understand better which groups are natural. meaning that they are defined entirely by a metric space. It appears that most groups are. I hope to wrap this project up soon and this video is a bit of a push. There is a working file available [PDF].