The word "rune," once, a long time ago, could refer to anything from a single letter to a whole poem, or to an object inscribed with these letters. Ari Berk knows this, and each elfin letter in this book grows or hatches or blooms or fractals out from a letter to a poem to a legend.
I got this book as a present, on the longest night of the year, and found warmth in those stories, found inspiration and magic, found myself feeling restored and refreshed from watching those stories grow.
The illustrations are wonderful and often reminiscent of art from "Good Faeries/Bad Faeries" or "Faeries" more than "strange stains and mysterious smells," but this is a good thing, as they aren't pictures to accompany silly stories: they're paintings to convey, with the help of Berk's retellings of old legends, the importance of stories, since stories have long been a window to Elfland if not a road.
If you like folklore, buy this book. If you like Brian Froud's art, buy this book. if you like stories that are on par with Neil Gaiman's in terms of creating the sense that these things are going all around us but we generally don't take notice, buy this book.