Patterns in Words and Letters
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The shape of the first letter recalls both the eye of the pyramid and the rocket standing on its fins. A is also a sort of reverse V - the V-2 was also known as the A-4. Finally compare the first and last typographical characters in the book: A and --. If the first is the rocket waiting to fly, the last is the flattened impact site with nothing left standing.
3.01 A screaming comes across the sky.
Note the internal alliteration of K and S, and the double s in "across", the first of many.