There is a plain in the Peruvian desert, between the Inca and Nazca valleys, about 200 miles south of Lima. An assortment of perfectly straight lines, some miles long, mark this plain.
Some lines run parallel and others intersect to form a grand geometric form.
Most readers will have come across the Nazca Lines at some time. Phenomena such as this are of perennial interest to TV documentary-makers. It is fascinating to ponder on the meaning of these lines and shapes drawn so large on the Peruvian desert. Explanations have ranged from astronomical maps to landing strips for alien spacecraft. However, it seems most likely to me that the lines are an expression of the religious rituals of the people who lived there 2,000 years ago.