Standing adjacent to the Basilica of Santa Maria del Fiore and the Baptistry of St. John, the tower is one of the showpieces of Florentine Gothic architecture with its design by Giotto, its rich sculptural decorations and its polychrome marble encrustations.
[2] His design was in harmony with the polychromy of the cathedral, as applied by Arnolfo di Cambio, giving the tower a view as if it were painted.
And instead of a filigree skeleton of a gothic building, he applied a surface of coloured marble in geometric patterns.
Through this work, Giotto has become, together with Brunelleschi (dome of the cathedral of Florence) and Alberti (with his treatise De re aedificatoria, 1450), one of the founding fathers of Italian Renaissance architecture.
Pisano was replaced in his turn by Francesco Talenti who built the top three levels, with the large windows, completing the bell tower in 1359.
The seven hexagonal panels on the south side show us Gionitus (Astronomy), the Art of Building, Medicine, Hunting, Wool-working, Phoroneus (Legislation), Daedalus (flight).
"The Madonna and Child" in the lunette and the "Two Prophets and the Redeemer" on top of the gable above the entrance door, are both attributed to Andrea Pisano.
The lozenges, on the next level, already show a different style: the marble figures stand out on a background of blue majolica.
The reliefs, statues and decoration make a coherent whole when interpreted in terms of medieval scholastic philosophy.