[3][4] The theater was not exclusively designed for theatrical performances, since it also served as a venue for gatherings and meetings among the citizens of Thorikos.

[2] Enhanced through multiple construction phases, the Thorikos Theatre stands as a remarkable testament to the development of ancient Greek architecture.

[1][5] Its antiquity characterizes it as a primitive Greek structure, solidifying its distinction as the world's oldest surviving theatre.

In recent times, the peculiar shape is also believed to result from multiple expansions that have been added to the theater's seating, with some overlaying the original arrangement.

In the first phase of construction, the theatre had about 19-21 straight rows of stone benches, with a retaining wall on the north side.