> It's simply a matter of a bit of math and careful planning and practice.
That lines up with what I suppose above. A few people, careful planning and a bit of basic math/surveying to make the Nazca figures.
But the Blythe Intaglios figures are much smaller, at 50 meters across I think I could probably make a figure like those by kicking around gravel for a day or two. No planning or math needed, I'd just eyeball it.
Drawing is hard enough for me that I can't imagine just kicking some dirt around for a few days to draw even a 10m stick figure, but I do get your point that it would definitely be easier than trying to draw a 50m, and in turn even harder for a 500m figure.
That lines up with what I suppose above. A few people, careful planning and a bit of basic math/surveying to make the Nazca figures.
But the Blythe Intaglios figures are much smaller, at 50 meters across I think I could probably make a figure like those by kicking around gravel for a day or two. No planning or math needed, I'd just eyeball it.