The shapes shown are the basic building blocks for architectural mouldings. They are divided into the following geometrical categories: plane, concave, convex, and compound. Among the straight moldings, a small straight surface is referred to as a fascia and a very small straight surface, a fillet. The concave and convex mouldings are typically based on portions of a circle or an ellipse forming the cove, ovolo, echinus, scotia, torus, and conge shapes. Compound mouldings combine these shapes into the cyma, beak, and ogee.

A Note on Proportion and Scale

To achieve a harmonius visual flow, moulding combinations should be proportionate to their space and internally well scaled.