Anta (architecture)
An anta, or sometimes parastas, is a term in classical architecture describing the posts or pillars on either side of a doorway or entrance of a Greek temple – the slightly projecting piers which terminate the side walls.
Antae are formed either by thickening the walls or by attaching a separate strip and can serve to reinforce brick walls, as in the Heraeum of Olympia.
Antae differ from the pilaster, which is purely decorative, and does not have the structural support function of the anta.
Anta
In contrast to columns or pillars, antae are directly connected with the walls of a temple. They owe their origin to the vertical posts of timber employed in the early, more primitive palaces or temples of Greece, as at Tiryns and in the Temple of Hera at Olympia. They were used as load-bearing structures to carry the roof timbers, as no reliance could be placed on walls built with unburnt brick or in rubble masonry with clay mortar. Later, they became more decorative as the materials used for wall construction became sufficient to support the structure.When there are columns between antae, as in a porch facade, rather than a solid wall, the columns are said to be in antis.