It is a fire extinguisher

[randompersonrandom]

Shift around a tiny bit, not change sizes. So you can be happy.

Arrrgh, I posted that, then took a nap and forgot all about it, and then just remembered it again. new primal fear unlocked: my ribcage shifting around. I do NOT like bone-based things being mobile. My teeth shifted around a tiny bit a few years ago, and I got it stopped but had HORRIBLE nightmares about it.