"but through my sight, which as I gazed grew stronger,
that sole appearance, even as I altered,
seemed to be changing. In the deep and bright
essence of that exalted Light, three circles
appeared to me; they had three different colors,
but all of them were of the same dimension;
one circle seemed reflected by the second,
as rainbow is by rainbow, and the third
seemed fire breathed equally by those two circles
Divine Comedy (Paradiso) - Dante