What does "in antis" refer to in terms of column placement?

The term "in antis" specifically describes a configuration in classical architecture where columns are placed between the antae, which are the vertical extensions of a wall. This arrangement places the columns directly in the plane of the wall, creating a cohesive visual connection between the wall and the columns.

In this context, the antae serve as a sort of framing device for the columns, emphasizing the entrance or opening of a portico or temple. This design not only enhances the structural integrity but also contributes to the aesthetic symmetry and order characteristic of classical architecture.

Other configurations, such as columns situated outside of walls or in a circular arrangement, do not fall under the definition of "in antis." The unique placement of columns in this way distinguishes it from more general column placements, which involve different spatial relationships and architectural intentions.