EN
Within the philosophical anthropology of Helmuth Plessner the concept of the boundary plays a prominent role. As a basic idea to understand the existence of living organisms the key concept of the boundary allows to conceive the specifics of human extistence in the term of the eccentric positionality as a fundamental constitution of man. The article tries to reconstruct the genesis and the systematic content of the concept of the boundary and to outline the consequences for Plessner’s social philosophy.