Which molding is concave at the base?

Which molding is concave at the base?

• A. Fillet
• B. Cavetto
• C. Scotia
• D. Bead

Answer: (C)

Concave at the base means the profile curves inward, creating a hollow along the lower edge. Cavetto is a shallow concave molding formed by a quarter-circle arc; its cross-section curves inward, so the base reads as recessed. This inward curve distinguishes it from a bead, which projects outward as a small rounded ridge, and from a fillet, which is flat or only gently rounded and not hollow. Scotia is also a concave form, but it represents a deeper hollow with a more complex curve, whereas cavetto’s simple quarter-round concavity is the typical example of concavity at the base.

Concave at the base means the profile curves inward, creating a hollow along the lower edge. Cavetto is a shallow concave molding formed by a quarter-circle arc; its cross-section curves inward, so the base reads as recessed. This inward curve distinguishes it from a bead, which projects outward as a small rounded ridge, and from a fillet, which is flat or only gently rounded and not hollow. Scotia is also a concave form, but it represents a deeper hollow with a more complex curve, whereas cavetto’s simple quarter-round concavity is the typical example of concavity at the base.