The album cover is Wasserstiefel (Water Boots) by Swiss artist Roman Signer.[5]
Composition
Pitchfork writer Nitsuh Abebe characterized Upgrade & Afterlife as a post-rock album where "folk and avant-garde abstract each other into something warm, minimal, and slanted".[6]
"Our Exquisite Replica of "Eternity"" contains a sample of the score from the 1957 science fiction film The Incredible Shrinking Man.[7] The title of the track is derived from the name of a cheap perfume marketed in public bathroom vending machines.[7]
"Dry Bones in the Valley (I Saw the Light Come Shining 'Round and 'Round)" is a cover of a John Fahey song, and features Tony Conrad on violin. According to David Grubbs, the idea of having Conrad play on "Dry Bones in the Valley" came to fruition after a Gastr del Sol show in Atlanta, where Grubbs observed Conrad "literally dancing with excitement" while Jim O'Rourke played the song alone onstage as an encore.[8]
Several sources misidentify track 3 as "The Sea Uncertain". This title, correctly rendered, appears to refer playfully both to a track on Gastr's previous full-length release titled "The C in Cake" and to one of Gastr percussionist John McEntire's other bands, The Sea and Cake, a moniker derived from McEntire's mishearing of that title.