Arre, mathematically toh it's about keeping the number line consistent—when you turn around twice, you face forward again. But in my life, I learned it from the old pine behind our house. For years I saw its shadow as a loss of sunlight, a negative. Only after it fell in a storm did I understand the shadow itself was a blessing, a negative times a negative… the absence of that cool shade in the summer is what truly feels like a subtraction. The proof was in the sweat on my neck.
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