I was just digging around the Whispered Falls lost sector, when I found a couple of poles with heads on them. I thought it was just decoration (as far as I know, it is) until I found one of those poles at the end of a winding pitch black tunnel with nothing else in it. The other two I know of are in the room following the boss fight room and in the big first room, behind a big rock pillar/platform on the ground to the right. The tunnel I found is also in that room, in the orange light on the right side of that room. I can't interact with the poles, whether by shooting or holding down a button, but I've got a gut feeling that something's up since they seem deliberately hidden. I'll try to get screenshots of the tunnel one. Thoughts?