The dazzling white marble of Pisa's Duomo and leaning campanile is most breathtaking in the noonday sun, but late afternoon is the blessed moment for the brilliant mosaic facade of Orvieto's cathedral.
Pisa's Duomo is covered in dull blue marble.
mnli hypothesis: Pisa's Duomo is covered in dull blue marble. premise: The dazzling white marble of Pisa's Duomo and leaning campanile is most breathtaking in the noonday sun, but late afternoon is the blessed moment for the brilliant mosaic facade of Orvieto's cathedral.