The torus is a surface or solid shape that is defined by a circular or ring-shaped cross-section and a curved or rounded shape. In architecture, the torus can be seen in the form of arches, columns, and other decorative elements. It is often used as a decorative feature to add visual interest and complexity to a building's design. Historically, the torus has been used in ancient Greek and Roman architecture, as well as in Gothic and Renaissance architectural styles. It is still commonly used in contemporary architecture as a decorative or structural element.
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