In case you fly over the desert on the southern coast of Peru, you’ll spot dozens of line drawings, stretching tons of of toes throughout the arid panorama. The Nazca folks created these photos—depicting such characters as a whale, a hummingbird, and an astronaut-esque man—almost 2,000 years in the past. The etchings could have served as an enormous astronomical calendar or supplied tribute to the gods, although their precise goal nonetheless eludes historians. Whereas some suspect alien interference, the strategies the Nazca used most likely aren’t fairly so far-fetched.
One idea holds that artists first painted these designs on canvas. They might sketch a picture, then scale it up proportionally with some sort of grid system, as immediately’s architects do with blueprints. They’d use poles and cord to map the traces throughout the desert.
To create straight traces, the Nazca folks would pull a twine taut between two stakes, then etch the paths by scraping away darkish rock to disclose a lighter layer beneath. They created spirals by tying a cable to a central submit and strolling round in circles.
Winds and rain might simply flip the desert again right into a clean russet canvas. That’s why the Nazca piled up oxidized stones on the perimeters of their markings; the rocks are heavy sufficient to resist gusts and the area’s scant rain, defending the traces inside.
These sketches caught public consideration within the early 20th century, as planes gave us a hen’s-eye view—one of the best ways to take them in. However the Nazca didn’t want anachronistic (or alien) flying machines to see their creations: They’re seen from close by mountain peaks.
This story seems within the Fall 2020, Mysteries difficulty of Standard Science.