Since their discovery, various theories have been proposed regarding the methods and motivations underlying the lines' construction. The archaeological explanation as to who made them and how is widely accepted; namely that the Nazca people made the lines using simple tools and surveying equipment. Wooden stakes in the ground at the end of some lines (which were used to carbon-date the figures) and ceramics found on the surface support this theory. Furthermore, researchers such as Joe Nickell of the University of Kentucky, have reproduced the figures using the technology available to the Nazca Indians of the time without aerial supervision. With careful planning and simple technologies, a small team of individuals could recreate even the largest figures within a couple of days.