Picture of the so called
"Industrial Sector" (factory houses) of the Machu Picchu Inca ruins in Peru.
It is hypothesized that buildings that are located below the Main Plaza were
used by workers to make weavings and pottery. For example, some mortars
were found in this area and some archaeologists believe these mortars were used
to grind plants to make dyes used during the manufacture of weavings and pottery
in this industrial sector of Machu Picchu. However, other scientists
believe that these so called mortars were in reality "seats" for holding pointed
base jars that contained "chicha" (a fermented drink). Others have
suggested that the mortars were made to be water basins which served as mirrors
for making astronomical observations of the moon. Like any archaeological
ruins, the true purpose of many artifacts is obscure and was lost with departure
of original habitants of the site.