"Oh sweetie, there's no monster down there."
*turns on light*
"That's just daddy's forge!"
A behind-the-scenes look at how I managed to make the furnaces look like a set of creepypasta horror eyes, I made use of some kind of light rendering bug that makes light bleed through the corners of blocks.
It would be really cool if this bug was somehow turned into a feature, maybe there could be some kind of chisel tool that we could craft which allows us to right-click on a block to allow the light to bleed through the corners.