ABSTRACT
The year 2011 marked 125 years from the birth of Tadeusz Kotarbinski, founder of the Polish School of Praxiology. The year 2012 marked 100 years since he received his doctor of philosophy degree for a work on utilitarianism in the ethics of Mill and Spencer. These dates are a good reason to present the profile and achievements of this great Polish philosopher. The students looked around at one another. The faces of those who had been drawn to philosophy by the need for a broad view of the world, the need for a great system, reflected their disappointment. The atomic level of Kotarbinski’s philosophical system is the universe of behaviors of a subject actively changing the existing reality, this subject being “a living body conscious in a state of wakefulness,” while reality is “a series of mutually dependent and changing things,” according to Kotarbinski.
