Harmonies built on the dominant (fifth scale degree) have a tendency toward the

that is true. stravinsky's rite of spring ballet is a prime example of with its focus on prehistoric culture, costumes, and dancing.

i think these large heads represent their gods and i do think they were worshiped by the people. if there was only one head and no heads around it i think it would be monotheistic but if there are several heads close to each other it could be polytheistic.