Cannon
You put a stone into a wrap of some kind. This wrap happens to be a cannon, and you're shooting off the stone, just like I used to do to boats with the cannon we had growing up for some reason.
ほう
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You aim the cannon at your own home (ほう). You don't want to have a home anymore, you want to become a pirate, live on a boat, and (of course) shoot cannons all day long.