Those windows would be seen by daylight to be of brilliantly-stained glass, purple and amber the predominant hues, glittering round a gravely-tinted medallion in the centre of each, representing the suave head of William Shakespeare, and the serene one of John Milton. 
Those windows are of brilliantly-stained glass, with purple and amber glittering round a medallion in the centre of each, representing the heads of Shakespeare and Milton. 