The Unconscious Before Freud by L.L. Whyte (Julian Friedmann Publishers)

A perfect use of Vexier, the “impossible” typeface devised by Christof Gassner, which was chosen as one of the winners of a competition held by Letraset in 1973:

Vexier attempts to develop a typeface which can be viewed from two diametrically opposed aspects. This causes the reader to change his viewing angle, creating confusion, uneasiness; and should inevitably attract attention.

For her jacket design, Fiona MacGregor combined Vexier with M.C. Escher’s surrealist Bond of Union from 1956. First published in 1960 by Basic Books, New York, this is the hardback edition by Julian Friedmann Publishers, London, from 1978, with an introduction by Arthur Koestler.

From Wikipedia:

The Unconscious before Freud: A history of the evolution of human awareness is a 1960 book about the history of ideas about the unconscious mind by the historian of science Lancelot Law Whyte. […] Whyte has been credited with showing how the predecessors of Sigmund Freud, the founder of psychoanalysis, established the concept of the unconscious.