They are attributed to Ghiberti and Donatello, and are lovely in colour.

The greens in particular are very striking.

But the jewel of these circular windows of Florence is that by Ghiberti on the west wall of S.Croce.
And here I leave the Duomo, with the counsel to visitors to Florence to make a point of entering it every day--not, as so many Florentines do, in order to make a short cut from the Via Calzaioli to the Via de' Servi, and vice versa, but to gather its spirit.

It is different every hour in the day, and every hour the light enters it with new beauty..