However this may be, the tomb carving shows between the heads, the ends of the beams that support the cornice and roof. As these are not found in the case of the columns at Persepolis, it appears that the roofs of the palaces were constructed of wood, which perished in the fire of Alexander. It has been remarked that the character of this whole portico, taken in connection with the wooden columns at Pasagardae, suggests that the style of Persian palace architecture was derived originally from a primitive wooden construction. But, while this may be true, its development into stone construction was not affected by the Persians themselves. They employed Asiatic-Greek workmen whose style of temple-building, like that of the Mainland-Greeks, shows the traces of primitive wood construction. Before leaving this tomb, there is one other feature to be noticed; namely, that the lintel of the doorway is surmounted by a cavetto-cornice, decorated with rows of conventionalised lotus-petals, derived through Lycia, from Egypt. The restored plan of the platform of palaces at Persepolis exhibits a monumental approach on the west side, formed of a double flight of marble steps, set in double ramp. The steps are 22 feet wide, with a rise of 4 inches and a tread of 15, so that they could easily be mounted by horses. The stairs led to a terrace, paved, as was the whole platform, with marble, in the centre of which was the entrance gate, or, to use the later classic term, a Propylæa. This was square in plan, with a portal, front and rear, flanked by winged bulls, while the ceiling was supported by four columns. Its walls, like those of the other buildings, built of sun-dried bricks or _rubble_ masonry, set with clay mortar, have long since crumbled into ruins. The earliest palace of the group is that of Darius I, to the portico of which we have already alluded. Its plan shows a room, right and left of the portico, in which may have been stairs leading to the roof; then a square hypostyle hall of sixteen columns, set in rows of four, with various chambers, along the sides and at the end. In one building, the =Hall of a Hundred Columns=, the roof was carried by ten ranges of ten columns; for the hall, as indeed were all the halls at Persepolis, was square in plan. This can scarcely have been a mere coincidence. Is it fanciful to imagine that a people, trained in Zoroastrianism, found in the principle of the square a fitting symbol of “Creative Strength” and “Right Order”?