What type of tools are used to make these things overnight and to leave the site without making a mess in the surrounding crops in the dark is a neat trick.

A Harvard prof. (not bama) says she tested a crop from a site and found that it was soft and at the molecular level was consistent with being steamed.  I can't remember yet where I heard that ytube clip but apparently orbs of light have been seen floating above crops in the dark and her theory is, since she said she saw them also, is they are some type of programmable device that emits the steam then disappear.

Ragged lines-unsymmetrical

Incredible symmetry-clean.