Subterranean Mysteries

Never mind what these are or how the pictures are done (it's easy enough to figure out). Think instead — if your character encountered something like this while lurking about underground looking for something to kill and/or steal, what would be your immediate reaction?

I'm betting that for most people it would be profound paranoia.

Yet Another Hill

 I got a cheap 30-watt foam-cutting hot wand from China a few days ago, and tried it out by carving up a foam off-cut into another hill. ...