We have disclosure! We now know why extraterrestrials make all those crop circles! Flying saucer are made from corn cobs! Just kidding 
“StAndré-Lang Architectes was inspired by the corn dryers of Alsace to create this unusual housing prototype clad in a cage of corn cobs.”
via Tourner Autour du Ried is a 20-Square-Meter Home Made of Corn Cobs!