in recent years there have been four interesting discoveries. during a minor cleaning in 1904 two slabs of marble near the altar were moved. underneath were the bright colours that showed what the frescoes should look like. examination of the areas where two windows had been changed showed the plans for two paintings that had been destroyed. the final discoveries in the chapel itself were two painted "roundels" with little angel faces in them, one by masaccio and one by masolino.