middle of the 18th century, when Sicily's Baroque architecture was noticeably different from that of the mainland, it typically included at least two or three of the following features, coupled with a unique freedom of design that is more difficult to characterise in words: Grotesque masks and putti, often supporting balconies or decorating various bands of the entablature of a building; these grinning or glaring faces are a relic of Sicilian architecture from before the mid-17th century (Illustrations 2 and 9). Balconies, often complemented by intricate wrought iron balustrades after 1633 (Illustrations 2 and 9), and by plainer balustrades before that date (Illustration 6). External staircases. Most villas and palazzi were designed for formal entrance by a carriage through an archway in the street façade, leading to a courtyard within. An intricate double staircase would lead from the courtyard to the piano nobile. This would be the palazzo's principal entrance to the first-floor reception rooms; the symmetrical flights of steps would turn inwards and outwards as many as four times. Owing to the topography of their elevated sites it was often necessary to approach churches by many steps; these steps were often transformed into long straight marble staircases, in themselves decorative architectural features (illustration 19), in the manner of the Spanish Steps in Rome. Canted, concave, or convex façades (Illustrations 1 and 6). Occasionally in a villa or palazzo, an external staircase would be fitted into the recess created by the curve. The Sicilian belfry. Belfries were not placed beside the church in a campanile tower as is common in Italy, but on the façade itself, often surmounting the central pediment, with one or more bells clearly displayed beneath its own arch, such as at Catania's Collegiata (Illustration 1). In a large church with many bells this usually resulted in an intricately sculpted and decorated arcade at the highest point of the principal façade (Illustration 3). These belfries are among the most enduring and characteristic features of Sicilian Baroque architecture. Inlaid coloured marble set into both floor and walls, especially in church interiors. This particular form of intarsia developed in Sicily from the 17th century (see the floor of illustration 14). Columns that are often deployed singularly, supporting plain arches and thus displaying the influence of the earlier and much plainer Norman period (Illustration 3). Columns are rarely encountered, as elsewhere in Europe, in clustered groups acting as piers, especially