I confirm that I am over 18 years of age, and understand that this website contains material featuring nudity and/or sexually-explicit material and/or adult themes that are age-restricted, and I confirm that by entering this website I agree that I am not offended by viewing such material.
A nice find! Done by some gardener in love with his lawnmower?
or maybe some alien race’s “to be assimilated” mark, just like we place our marks on trees that are to be cut.