It's that forbidden, imperfect connection -- when things that don't make sense piece together perfectly.
Literally, it's everyday things fitting seamlessly into other everyday things.
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In some sort of beautiful twist of nature, it seems that the manufacturers of very different products have created similar size standards. And the single topic Tumblr page "Things Fitting Perfectly Into Things" is dedicated to finding and displaying the miraculous act of pairing objects with their oddly wonderful same-sized mate.
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