Circular objects related to historical civilization

The auspicious patterns of dragons and phoenixes with the most China folk customs-the sun-the golden ornaments of the sun god bird at Jinsha site in Chengdu, Sichuan,

Stonehenge in Britain is also surrounded by many stone pillars, the Colosseum in ancient Rome-a typical circular building.

Give two examples at home and abroad, both concrete and abstract. Isn't it very convincing?