<P> Many historians believe that the choice of gold was to distinguish the more "sacred" or "holy" pieces from others . The commonality of gold has much to do with the Incan religion surrounding the sun . Because of the beautiful reflection that gold casts, it gave the appearance of containing the sun, making the precious metal even more valued in a sun - obsessed society . Gold was reserved for the highest class of Incan society which consisted of priests, lords and of course the Sapa Inca or emperor . </P> <P> The Inca used quipu or bunches of knotted strings, for accounting and census purposes . Much of the information on the surviving quipus has been shown to be numeric data; some numbers seem to have been used as mnemonic labels, and the color, spacing, and structure of the quipu carried information as well . Since it isn't known how to interpret the coded or non-numeric data, some scholars still hope to find that the quipu recorded language . </P> <P> The Inca depended largely on oral transmission as a means of maintaining the preservation of their culture . Inca education was divided into two distinct categories: vocational education for common people of Inca and highly formalized training for the nobility . </P> <P> The belief system of the Incas was polytheistic . Inti, the Sun God, was the most important god, which the Incas believed was the direct ancestor of the Sapa Inca, the title of the hereditary rulers of the empire . </P>

What were the social classes of the inca society