The sunstone is a real Aztec calendar that inspired Octavio Paz in writing this poem. A visual might help you imagine what his mind was working with.
What can we say? He's kind of a big deal. Octavio Paz received the Nobel Prize for Literature in 1990.
Paz studied law, but didn't ever graduate because he didn't want to be a lawyer like his family wanted. His dream was to be a poet, and the best part is, he totally made that happen. (Source.)