The excavated light channel projecting the sun light

Cave C6 of the Risco Caído archaeological complex was thought to be an almogarén or sanctuary. This is an excavated enclosure with a circular floor plan. In addition, the paraboloid outline of the dome, the uniform pattern of measurements and proportions, and the way of working the materials demonstrate formal originality and an unusual constructive genesis in a culture with such limited resources.
However, in addition to its special architecture, the most significant aspect is that this cave demonstrates optical inventiveness in the form of an excavated light channel projecting the sun or full moon light on a wall in the main chamber, exactly where we find rock art in the form of bowls and pubic triangles etched in low relief. This is a unique representation that shows a visual, hitherto-undocumented, language for these cultures.