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The exterior has bichrome marble bands which re-use Roman stones.
The Romanesque façade shows typical features of the Pisane medieval architecture, such as the blind arcades, the lozenges and the use of bichrome stones (present also in the city's cathedral).
For the construction were used sandstone and bricks to give a bichrome appearance to the exterior (such as in the upper façade), a feature common also in Liguria and Tuscany in the Middle Ages.