Some key features of Roman columns include:
1. Capital: The top part of a column, which can have various designs such as Ionic or Corinthian.
2. Shaft: The long, vertical part of a column that supports the weight of the structure above it. The shaft can also have different fluting patterns.
3. Base: The bottom part of a column that rests on the ground or a pedestal.
4. Entasis: A subtle bulge in the middle of the column that creates an optical illusion of the column being perfectly straight.
5. Material: Roman columns were typically made from materials like marble, limestone, or travertine, and were often highly decorated with relief carvings or painted designs.
6. Proportions: Roman columns were designed according to a strict set of proportional guidelines, such as the ratio of height to diameter, known as the "orders" of architecture.
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