A drawing which appears to be distorted unless viewed from a particular angle or with a special device.

1. A circular, semicircular, or elliptical auditorium in which a central arena is surrounded by rising tiers of seats. 2.

The sloping top of a buttress or projecting pier.

Marked by columns in porticoes only at the front and back (of a classical temple), not on the sides.

A C-shaped structural member of hot-rolled structural steel; designated by the prefix C placed before the size of the member.

1. A passageway around the apse of a church, or for circumambulating a shrine. 2. A covered walk of a cloister.

1. A cupboard or niche in a chancel wall for the utensils of the Eucharist; an armarium. 2. A storage place, storeroom, closet,