Architectural curves are an important part of the design of buildings and structures. The term 'architectural curve' can refer to a variety of different shapes, including ARCH, OGEE, DORIC, IONIC, ENTASIS, and WRIGHTHOOK. An ARCH is a curved structure that spans an opening and is often used in doorways and windows. An OGEE is an S-shaped curve that is often used in decorative moldings. A DORIC is a type of column with a simple, tapered shape. An IONIC is a type of column with a more elaborate, fluted shape. ENTASIS is the slight convex curve of a column that gives it an illusion of being straight. Finally, a WRIGHTHOOK is a curved shape that is often used in staircases.