Spirals!

They exist throughout the universe, from the smallest seashells to the largest galaxies.

They exist in mathematics and arts.

The neolithic monument of Newgrange, Ireland, is 5,200 years oldβ€”older than Stonehenge or the Egyptian pyramids. One remarkable feature is the big entrance stone that carries beautiful spiral engravings.

If you enjoyed the book "The Good Spy Guide: Secret Messages" by Falcon Travis and Judy Hindley in your youth, then (a) you are probably as old as I am, and (b) have learned, and maybe even used, the spiral cipher for encrypting and decrypting secret messages.

I don't know whether the designers of the C language knew this book, too, or whether they unintentionally have introduced spirals into the language. But they do exist, and they play a vital role in reading declarations.

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