The Musical Brain has a fantastic design - not only is it Aira's only hardcover with New Directions, it features a lenticular cover of a neon hand tapping out a rhythm:
Further, the signature here is particularly notable. I did a quick look online to retailers and there isn't a single signed book by César Aira out there for purchase. There's no telling what the value might be here (no real comparables) -- Aira seemed quite reluctant to sign books at all in Brooklyn, so there might not be many of these out there at all.
Swamp Thing by Alan Moore
Currently Listening to:
Ork Records: New York, New York (Numero Group)