As commercial satellites get better and better, the pictures from their military counterparts will no longer be the last argument of kings, as they were in the Cuban missile crisis. Photo interpreters will assume places as pundits on the network news. More pictures will also mean more interpretations because so much depends on the eye of the beholder, as anyone who has ever seen a spy-satellite photo will attest. This Carnegie Endowment volume is a rich, if richly priced, introduction to these emerging issues.