one or both sides to macerate the fibers. These beaters are still used by Otomi artisans, and almost all are volcanic, with an additional groove added on the side to help hold the stone. According to some early Spanish accounts, the bark was left overnight in water to soak, after which the finer inner fibers were separated from coarser outer fibers and pounded into flat sheets. But it is not known who did the work, or how the labor was divided. As a tribute item, amate was assigned to the royal sector because it was not considered to be a commodity. This paper was related to power and religion, the way through which the Aztecs imposed and justified their dominance in Mesoamerica. As tribute, it represented a transaction between the dominant groups and the dominated villages. In the second phase, the paper used by the royal authorities and priests for sacred and political purposes was a way to empower and frequently register all the other sumptuary exclusive things. Amate paper was created as part of a line of technologies to satisfy the human need to express and communicate. It was preceded by stone, clay and leather to transmit knowledge first in the form of pictures, and later with the Olmecs and Maya through a form of hieroglyphic writing. Bark paper had important advantages as it is easier to obtain than animal skins and was easier to work than other fibers. It could be bent, shirred, glued and melded for specific finishing touches and for decoration. Two more advantages stimulated the extensive use of bark paper: its light weight and its ease of transport, which translated into great savings in time, space and labor when compared with other raw materials. In the Aztec era, paper retained its importance as a writing surface, especially in the production of chronicles and the keeping of records such as inventories and accounting. Codices were converted into "books" by folding into an accordion pattern. Of the approximately 500 surviving codices, about 16 date to before the conquest and 4 are made of bark paper. These include the Dresden Codex from the Yucatán, the Fejérváry-Mayer Codex from the Mixteca region and the Borgia Codex from Oaxaca. However, paper also had a sacred aspect and was used in rituals along with other items such as incense, copal, maguey thorns and rubber. For ceremonial and religious events, bark paper