Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?

Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?

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Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.

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Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain. Doing no harm, and feeling no pain.

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You saw me where I never was and where I could not be. And yet within that very place, my face you often see.

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Iron on a mammal. Mammal on your feet.

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Riddle of the Day

Jan 19, 2025

A mysterious, fantastic creature, It has one defining feature, And for humans at their worst, In their eyes it's just a horse

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