The topic of this paper I would like to divide into two other questions than that of its title. The first question is the historical one and sounds like this: Why had Tarski chosen physical objects as truth-bearers in his original work from 1933 about truth in formalized languages?¹ This historical problem may be still of importance not only from a historical point of view. Tarski's truth-definition is still seen as one of undeniable importance for any contemporary philosophical analysis of truth.