Covers with circular motifs keep catching my eye recently, which got me thinking about circles in general, and their meanings. And once I started, I realised that they are literally everywhere.

They're found in nature (the sun, pebbles on a beach, ripples in water), they're used in religion (in Chinese symbology they represent the heavens, and are found as haloes in Christianity), and they also pervade our language: “circle of friends,” “coming full circle,” “circle of life.” (Sing it, Elton!)