Buildings and structures by shape

thumb|upright|Schematic plan of a monopteros A monopteros (Ancient Greek: , from: μόνος, 'only, single, alone', and , 'wing'), also called a monopteron or cyclostyle, is a circular colonnade supporting a roof but without any walls. Unlike a tholos (in its wider sense as a circular building), it does not have walls making a cella or room inside. In Greek and especially Roman antiquity, the term could also be used for a tholos. In ancient times, monopteroi (Ancient Greek: ) served among other things as a form of baldachin for a cult image. An example of this is the Monument of Lysicrates in Athe

A hemicycle is a semicircular, or horseshoe-shaped, legislative debating chamber where members sit to discuss and vote on their business. Although originally of Ancient Greek roots, the term and modern design derive from French politics and practice.