This book offers a synoptic introduction to an important chapter of Polish 20th century philosophy, by introducing the studies of Kazimierz Twardowski, Tadeusz Czeżowski, Tadeusz Kotarbiński, Władysław Tatarkiewicz, Roman Ingarden, ...
... Czesław Porębski for their invitation, and to Dr. Krzysztof Kowalski and Dr. Martin Galent for their hospitality and their encouragements. I thank Łukasz Kocój, Director of the Jagiellonian University Press, for accepting the book ...