Abstract
Piero della Francesca's fresco is an overall vertical composition. It is organized in four roughly equal parts: the white vertical column divides the space in the middle while the two stories building and the dark lines that follow the top of the first story divides it on a horizontal axis. In the two bottom quadrants the angel and the Virgin Mary are standing, whereas the two top quadrants are composed of God on the left and a purely architectural space on the right that is the second floor of the building, with a window in it and a rope and a loop crossing upon it. Thus, the fresco is hierarchically composed with respect to both the architecture and the "Istoria".
