Air expands when heated! What you see in the photo is proof!
I had the kiln loaded and was reading for a few hours before bed when I heard a strange sound which I can’t really describe. But I had the feeling that it was something in the kiln breaking. All I wanted to do is open the kiln to see what was going on, but of course I couldn’t.
It wasn’t until the next morning that the kiln was cool enough to open. Although I was dismayed that this raccoon was ruined, I was grateful that everything else in the kiln was undamaged.
I put the pieces together to see if I could figure out what had happened, and wouldn’t you know it, I forgot to poke a hole in the bottom of the hollow sculpture. I was mad at myself for being so careless, but glad that the lesson didn’t cost me more!