In a brilliant, wide-ranging anthology, Strahan presents stories by authors as diverse as Karen Joy Fowler, Elizabeth Bear, and Paul Di Filippo. Ellen Klages contributes “Lotion,“ a story about imaginary numbers and the strange powers of math, in which a young girl discovers the magical potential of pure math. Ellen Kushner’s “Dolce Domum” is, perhaps, not about what its characters think it is. Bear’s “Swell” is a fairy tale about a musician seeking her voice, in which a mermaid’s gift is not as wonderful as at first glance it seems. Molly Gloss’ “The Visited Man” presents a lonely pensioner who lives upstairs from le douanier Rousseau and the relationship that develops after the painter...