Schrödingers Katze: Das Universum Nebenan/Der Zauberhut/Die Brieftauben

The Schrödinger’s Cat Trilogy is a series of novels by Robert Anton Wilson, each illustrating a different interpretation of quantum physics. Coauthor of The Illuminatus! Trilogy, Schrödinger’s Cat is a sequel of sorts, reusing several of the same characters & carrying on many of the themes.
The 1-volume edition in print is significantly shorter than the original 3-volume edition. This is not a difference in print size or removal of redundant “recaps”; it is missing a noticeable amount of material, including many entire chapters.
The name Schrödinger’s Cat comes from a famous thought experiment in quantum mechanics. The 1st book, The Universe Next Door, takes place in different universes in accord with the Many-worlds_interpretation of quantum physics. In the 2nd, The Trick Top Hat, characters are unknowingly connected thru Non-locality, i.e., having once crossed paths they’re joined in Quantum_entanglement. The 3rd book, The Homing Pigeons, places characters in an “observer-created universe” in which Consciousness Causes the Collapse of the wavefunction.