This is what it looks like when you have a run-in with a meditation stool (in a shop, there's none at my place) and the meditation stool wins.
Two minutes before this happened (I think the corner flipped up and whacked - didn't actually see the incident, just heard the yelp), I'd told E to put the stool back and the man in the store said: "Just yesterday a kid hurt themselves on that."
It came up nastily blue in 30 seconds. And not pretty today either.
How ironic, though, to score a bruise like that from a meditation stool?! Not very non-violent, not very zen and certainly not very calm!