Ancient Calendars Shirt

Ancient civilizations such as the Mayans and Aztecs had their own system of calendars. Skilled astronomers and mathematicians created these complex systems that consisted of several interlocking cycles. This is very evident in the design patterns of these calendars. Oddly enough a NYC sewer cap looks like it may have been designed by a Mayan or Aztec. And why not? The sewer system in New York City (NYC) is also a vast and intricate network. However, it was designed to manage and transport wastewater and stormwater not so much for calendar usage.