Flash + Cube (1965-1975) is an artist’s book about the Sylvania flashcube — the space-aged, flash photography device, revolutionary in 1965 and nearly obsolete by 1975. Assembled from a wide range of archival materials — a “terrorist letter,” G.I. photographs from Vietnam, Sylvania flashcube advertisements, as well as Long’s photographs and photomontages—the book explores the link…