<em>Sphere</em> is the second of A. R. Ammonss long poems--following <em>Tape for the Turn of the Year</em> and preceding <em>Garbage</em>--that mark him as a master of this particular form. The sphere in question is the earth itself, and Ammonss wonderfully stocked mind roams globally, ruminating on subjects that range from galaxies to gas stations. It is a remarkable achievement, comparable in importance to Wallace Stevenss <em>Notes Toward a Supreme Fiction</em>.