This large architectural fragment in white and green marble is the upper pointed structure of one of the four triple-lancet windows of the top loggia of Giotto’s bell tower, replaced during a past restoration. The bell tower was completed by Francesco Talenti in 1359, and this element was made to his design shortly after the mid-14th century.

The tripartite pointed structure is formed by leafy frames drawing refined geometric patterns: in the lower part, intersecting round arches trace three ogival frames, resting on the columns of the triple-lancet window and including two quadrilobate openings; in the upper part, a central oculus with a foliate frame is flanked by two lateral circles, all pierced with star-shaped perforations.

This star-shaped motif is not merely decorative but also holds symbolic meaning, referring to the Madonna, the titular figure of the cathedral: Mary, in fact, bears the ancient title of “stella maris” ("star of the sea"), as a guide for the life of Christians.