Underwater sculpture (in Grenada) remembering Africans thrown overboard from slave ships.

A very impressive picture
Why they are facing outside?
      They are prepared to defense something. This is not a party.
Why all of them are in the circle?
      That is the best way to protect a largest area.

I am not going to talk too much about this picture, because I can’t find more words to describe my feeling and the readers may have different thinking than me.
If aliens visit the Earth one day in the future, all the people may stand in a circle facing outside, but, not now.

https://twitter.com/DeeDianaCosford/status/434535939189141504/photo/1