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Odd Little Things · entry 9 of 52
A mirror reverses left and right only because you imagine yourself stepping behind its surface.
The longer version
A flat mirror does not swap left and right; it reverses front and back. Light from your right hand reflects straight back, so that hand still appears on your right. The confusion comes from mentally rotating yourself into the image: to face yourself you would have to turn around, and that imagined turn is what produces the apparent sideways swap.
Writing held up to a mirror looks reversed because you are reading the back of the page, not because the mirror attacks handedness. Text on a transparent sheet looks normal from behind. People also misread reflections as faithful copies of reality, when every image depends on the observer's position and two people standing apart see different pictures.
Where this entry sits
Odd Little Things looks at the ordinary objects people touch every day and the small mechanisms and histories hiding inside them. Buttons, zips, pencils, mirrors, stairs, stamps, packaging, and road signs all get their turn. The full list sits on the Odd Little Things page, where every entry is listed in order.
More From Odd Little Things
Eight more entriesPolished metal served as the earliest mirror long before glass mirrors became widespread.
Read 11Stairs are built with a rise and a run that together determine how steep the climb feels.
Read 12Handrails exist largely to give the hand something stable to hold while balance is shifting.
Read 13A door handle works as a lever that pulls a latch back so the door can swing open.
Read 14Round doorknobs became common partly because a smooth shape is easy to grip and turn.
Read 15Coins often have milled edges, a ridged pattern originally meant to reveal clipped metal.
Read 16Reeded edges on coins also make stacks easier to handle and harder to counterfeit crudely.
Read 17Postage stamps were introduced so the sender could pay delivery costs in advance.
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