 Subsequently, Fra Angelico demonstrated an understanding of linear perspective particularly in his Annunciation paintings set inside the sort of arcades that Michelozzo and Brunelleschi created at San’ Marco's and the square in front of it.When Fra Angelico and his assistants went to the Vatican to decorate the chapel of Pope Nicholas, the artist was again confronted with the need to please the very wealthiest of clients.In consequence, walking into the small chapel is like stepping into a jewel box.