The Plurality of RealitiesThe Plurality of Realities contains four texts by Leon Chwistek that deal with his original philosophical conception called the theory of plurality of realities. This collection is essential not only for understanding the full fledged version of Chwistek's conception but also for surveying its development over a span of five years (19161921). Reading these essays in chronological order allows us to notice all stages of its development, beginning with