蜘蛛の巣 spider web

蜘蛛の巣は、垂直に同心円状に作られると思っていました。ところが、この蜘蛛は水平に巣を作っています。効率悪くありませんか。
もしかしたら・・・、強風でこわれた巣の修復中ですか。

I think that the spider web would be made concentrically vertically. However, this spide is constructing a horizontal spider's web. Don't you think it isn't inefficient?
Maybe ... Are you repairing your web broken by a strong wind?

looking up