I read the article about "circle" in the class. The article was difficult to understand for me. Even when we read it in the group, I couldn't understand what it was saying. So I'm not sure whether I'm in the right track, but the article was talking about the nature.
For example, seasons goes around, starting from spring, summer, fall, winter, and goes back to spring again. The time is one example of circle in the nature. We are in the circle of waking up and falling asleep. Weeks and years goes around the circle too.
