Fra Angelico we know already as the painter who devoted his life to picturing the departing mediæval vision of a heaven upon earth. Nothing could have been farther from the purpose of Uccello and Castagno. Different as these two were from each other, they have this much in common, that in their works which remain to us, dating, it is true, from their years of maturity, there is no touch of mediæval sentiment, no note of transition.