You must read this and "Where are they?" to answer the Quiz!
Many people have offered many theories, like this one by G. Von Breunig. In 1980, G. Von Breunig suggested that the lines were used for running footraces. He examined the curved pathways and determined that they were partially shaped by continuous running . He evolved this thesis into a scenario in which local races led up to national events in which the runners had distinguishing team outfits, supposedly depicted on Nazca pottery. Also a second innovative purpose for the Nazca lines was theorized by William H. Isbell in 1978. He created an analogy between the work gangs that created pyramids in Peru and the creation of the Nazca lines because both occured at the same time. The Nazca society organized work gangs as a "social mechanism for investing unpredictable surpluses in cermonial activities" in order to regulate population. The final (pseudoscientific) not proven, theory was proposed by E. von Dainken and is an example of today's society being forced upon that of the Nazca. He thought that the Nazca lines were runways upon which aliens landed their spacecraft and that Nazca masks depicted the faces of these aliens.