Public
You have fins in private. But, you want the world to see them, so you take them public.
Picture yourself in private, with fins. You wish others could see them. "That's it," you decide. "It's time to show the world. I'm going to make my fins public!"
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You head out into the public where everyone can see your fins, but... things have changed. All people are the same. There are thousands of こういちs walking around, and they all stare at you (though they pretend like they aren't).
How long have you been hiding in private with your fins? The public areas have changed, and all the people have become こういちs. One mother こういち--pushing a baby こういち--looks up and stares at your fins. Now you remember why you never go out in public.