What did Scylla look like? Homer gives her six heads armed with triple rows of teeth on her shoulders. Ovid gives her six dog’s heads at her waist and twelve dog’s legs. Neither of them mention the long mermaidy fish-tail that she’s usually depicted with in art (where she’s a sort of mermaid with a dog or two grafted to her waist).

So which is right? One or all of them? Rodney Matthews’ excellent illustration from The Usborne Book of Greek and Norse Legends (1987) bravely tries to include as much as possible.

All in a very alien sort of look. No twelve legs though.

Tolkien’s color pencil sketch of Smaug means a lot to me, not least that it was the cover of my first Hobbit book and I was convinced, pre-reading, that that twisty flying thing was The Hobbit. With feathery red plumes on its head and a little smiley face where Smaug’s chin is.

But I digress. Check out Tolkien’s notes on the margins. “Bard the Bowman should be standing after release of arrow at extreme left point of the piles”, “Dragon should have a white naked spot where the arrow enters”, and best of all, “The moon should be a crescent: it was only a few nights after the New Moon on Durin’s Day”. Oh Tolkien you wonderful nerd.