obsidian knife blade a valuable tool and ceremonial item

obsidian knife blade valuable tool ceremonial item illustrationmaya civilization tikal chichen itza palenque copan maya citystates pyramids hieroglyphs long count calendar codices rituals ballgame glyphs stelae quetzalcoatl rain god jade maize cultivation classic period postclassic bloodletting cenotes yucatan peninsula itzamna mythology ancient mayan writing mathematics architecture art sacrifice cacao tzolk 039 haab ruler uxmal puuc lord king codex dresden madrid paris ceramics