Re: Netfliks-crop circles.
Most crop circles by here are made by Tubby Thoroughgood and his his mates from the Young Farmer's club.
There are a few less well know circle makers, some of whom cheat by using geo-positioning surveying sticks, but Tubby still uses the tried and tested method of walking into a field backwards, and marking out using surveying height rods and theodolite.
For the circles themselves, he uses a horizontal plank on a rope round his neck so he can bend down, stand on the plank, then stand up before taking a plank-width step back and repeating the process.
His mates help with the more complicated designs using their own planks, and all using the same plan. These used to be drawn and copied by hand, but now they are drawn using a CAD programme so the circle makers (who must be members of a Guild) can keep up with demand.
Different techniques have to be used of course for different types of crops. You need bundles of Willow Rods tied together for parting maize plants because the stalks are too tough to bend in groups using the plank method.
As for Stonehenge, the grant for the original structure was cancelled, so the builders just abandoned the scaffolding since they weren't paid after that.