Contents:
. "Divine Madness" by Roger Zelazny (1966)
. "Break the Door of Hell" by John Brunner (1966)
. "The Immortal" by Jorge Luís Borges (1962)
. "Narrow Valley" by R. A. Lafferty (1966)
. "Comet Wine" by Ray Russell (1967)
. "The Other" by Katherine MacLean (1966)
. "A Red Heart and Blue Roses" by Mildred Clingerman (1961)
. "Stanley Toothbrush" by Terry Carr (1962) (originally under the penname Carl Brandon)
. "The Squirrel Cage" by Thomas M. Disch (1966)
. "Come Lady Death" by Peter S. Beagle (1963)
. "Nackles" by Curt Clark (1963)
. "The Lost Leonardo" by J. G. Ballard (1964)
. "Timothy" by Keith Roberts (1966)
. "Basilisk" by Avram Davidson (1967) (story published for the first time in this anthology)
. "The Evil Eye" by Alfred Gillespie (1966)

From the back cover:
Step Outside Your Mind ... into worlds of wonder and magic, where alien creatures assume unsuspecting forms, where Chaos impinges fatally on Reality, where time runs backwards and Death is a beautiful young girl...

Here is a new experience in reading - fifteen stories of modern fantasy by today's finest writers, including several published for the first time in this country, and a new novelette by Avram Davidson appearing here for the first time anywhere.

This unique anthology shows what is happening now in the fascinating new worlds of fantasy. Don't miss it!

Note that this book was reprinted in England as "Step Outside Your Mind" (1969)