What I love about those things is that no one that believes them stops to think "these aliens were smart enough to create vessels capable of traversing the vastness of space, but they can't comprehend the fact that we use written language not whatever the hell crop circles are supposed to mean other than Visual Math Pretty."
Whoever made the Milk Hill formation: you're an artist like few other. If we treat these crop circles as land art, this is one of my favourite of all times. Do not hide if you do this - except from the farmers whose harvest you ruin, maybe - it's...technically difficult.