Halls in the shape of rectangles were a defining theme of Greek architecture. The Mycenaean megaron originated from the "megaroid", or large hall-centered rectangular building, of Greece dating back to the Late Neolithic and Early Bronze Age. Also, it was the architectural forerunner to ancient Greek temples. The megaron's structural layout included a columned entrance, a "pronaos", a central "naos" (or "cella"), and one of many roof types (i.e., pitched, flat, barrel). The roof was supported by wooden beams. The floor was made of patterned concrete and covered in carpet. The walls were built with bricks of mud, and were decorated with frescoes. There were metal doors often having two-leaved wood decorations. Footbaths were also used in the megaron as mentioned in Homer's "Odyssey" where Odysseus's feet were washed by Eurycleia. The dimensions involving a larger length than width are similar structurally to the early temples of the Dorian Greeks.