"Early Classic Petén masonry was clumsy and heavy, weighty roofcombs leaving little interior space. At Palenque a different aesthetic prevailed, and its architects set corbeled vaults parallel to one another, with a light, cut-out roofcomb over the central wall. Not only did this allow for greater interior space, but it also stabilized the whole construction, and it is partly because of this innovative technique that Palenque architecture is so well preserved today. Solid mass gave way to a web-like shell for the first time in Mesoamerican architectural history."
Mary Ellen Miller, The Art of Mesoamerica from Olmec to Aztec, p. 124