Guarini’s domes and stairways use structure to produce effects that cannot be understood from photographs alone. Their visibility also depends on worship, museum access and conservation.
Juvarra worked at a metropolitan scale, linking palaces, churches, gates and distant residences. Not every coherent view was realised at one moment, and later street widening altered several relationships.
Arcades shelter ordinary movement and commerce. Their continuity is a public asset sustained by many separate properties, thresholds and maintenance decisions.
Use morning and late-afternoon light to compare brick, stone and dome geometry; enter churches only around services and read the arcades as working circulation rather than a decorative tunnel.