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Enigmas and puzzles

By Ian Stewart   November 2007

I always think they look like music,” Sanguimenta said.

“Yes… what? What are you talking about?” said Innumeratus.

“Those birds sitting on the phone lines. They’re a string of fat black blobs on parallel lines. They look like musical notation.”

“Ah, yes. But there are only four lines here—music uses five.”

“Stop quibbling. There are two birds on each of the top three wires. And they all form a pattern. If you look at the other lines, there’s one bird positioned between the birds on line one.

“That’s not terribly impressive, Sanguimenta.”

“No—but there are also two birds between…

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