art how?

I have enjoyed the first 2 of a series exploring how art influenced the making of our world...last night was an interesting topic about early art being a reflection of halucinations induced by rituals and mind altering substances....turns out scientists think there is a part of our brain that "sees" color and pattern when certain conditions are present.....very interesting...here is the link to the pbs site for this show...check it out... http://www.pbs.org/howartmadetheworld/