is (was?) the world's foremost expert on the Nazca lines. Apparently, the designs served the purpose of some kind of giant calendar with lines pointing towards certain heavenly bodies at certain times of the year. Also, Dr. Reiche said she found ancient bolts of cloth and chalk in the vicinity of the lines and thinks they first existed as large drawings on cloth that were then proportionally expanded into giant sized scratchings in the dirt. So in other words, by looking at their own cloth paintings of familiar symbols in their culture, they knew what they looked like, once expanded with exact attention to proportions.
http://www.labyrinthina.com/mariareiche.htm"...The geometric drawings are directed toward horizon points marking the rising and setting of the heavenly bodies and most likely served to mark the sowing and harvest time, and the distribution of food during the dry period of the year. The figures indicated the division of the year by way of constellations, with respect to their positions at night. The most important epoch of the year was, until now, December. This was the month the rivers would fill to the brim with muddy water that brought life to the fields. Now this has all stopped. There is an eternal drought here due to the contamination of air quality preventing the clouds from reaching the high mountains to fill the rivers. ..."
"...I am most interested in how the ancient people solved the technical problem of producing these huge figure drawings in such perfect proportions, at the same time not being able to recognize their shape from the ground. Enlarging the image from a smaller model could have only done this. But the model could not have been too small! For instance, it would take the figure of the monkey (18 meters in diameter), the toes having a length of less then 2 meters. In order to have every detail of the figure appear on the chart in its proper size and direction, proportion, and position, within the figures in a way that could have been enlarged, the chart must have been at least the length of 2 meters. The only material for such a chart is cloth.
In excavations at the foot of the plains people have found huge bolts of plain cloth without drawings. I have often found small pieces of red and white chalk on the pampa which did not belong to the area, but which could have been used to make drawings on the cloth. We know that these people not only wove their patterns on cloth, but also drew, and painted them. ..."