I think the circle means
the essential source of life.
In space there are many
circles which are essential to our lives, such as the sun, the earth, planets
and an atom. People can’t help but consider the circle as important thing
before we realize it.
In Japan, kanji character
“圓” shows the meaning of the circle. “圓” is an old
shape of “円”. The fundamental part of this kanji
character is “囗”, which means circulate. We can see many
circulations in our life such as food chain and economic system. These circulations are
really important for a living thing, so I take the circle as mentioned above.
