What does one see inside a spherical mirror? from Interactive Mathematics Miscellany and Puzzles

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What does one see inside a spherical mirror?

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You are an observer standing at the bottom of a spherical mirror. You head is a blue circle, originally above the center point. You may define your height by dragging this circle up and down. Another blue circle is located on the surface of the sphere, and this is the point you are staring at. Of course what you see in the mirror is a reflection, but of what?

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