Furnace.

This is actually what I did for the whole day.

(If you can't tell what it is, I made a cave house dug a huge mazing underground tunnel.)

This took about 4 hours.

//EDIT:

YOU KNOW WHAT NOW IS A GOOD TIME FOR?
ANOTHER ADDITION TO...
"THINGS THAT LOOK LIKE FACES BUT AREN'T FACES"

I had to break my windows, which are actually sort of hard to get, to get the eyes in.