This book reminded me of Ursula K Le Guin's writing. Something about the descriptions, the pacing, the plotting, the characters, echoed that author's mode and style. Not that I think Wild Seed is derivative in any way - it is one of the most unique stories I've come across recently - merely that the author happened to have similar style and preferences to Le Guin. Also like Le Guin, Butler takes a fairly common concept - that of immortals interacting with mortals - and follows through on it in a way that makes it compelling and original. This is, in many ways, what I've always wanted to see in a book that tackles that concept.