Ritual fire on a mountain summit: ancient signals...

‘The ritual included a lord climbing a mountain; shooting arrows from the summit in the four world directions in the sequence west, east, north, south; tying long grasses (malinalli in Nahuatl) into bundles, piling them up, and lighting a fire to them - a fire that would be seen by everyone. The lord would then descend the mountain and climb to another to repeat the sequence. In this fashion, the boundary markers were made on each mountaintop.’ The lighting of the fire on the summit ‘completed a prescribed ritual sequence of foundation and taking possession’ of sacred lands.

Info and quote from the chapter by Carlos Rincón Mautner ‘Cave, Mountain, and Ancestors’ in Mesoamerican Memory: Enduring Systems of Remembrance edited by Amos Megged and Stephanie Wood, University of Oklahoma Press, 2012
Image of a man lifting his cape to receive the warmth of a fire set atop a sacred mountain; Codex Vindobonensis, fol. 8 - image scanned from our own copy of the ADEVA facsimile edition, Graz, Austria, 1974.