The series of photographs entitled Prison (2000 - 2001) presents an unembellished image of the modern penal system. The focal point of the artist are the portraits of people serving their sentences in these strictly controlled institutions, as well as the architecture and the general visual appearance of a penitentiary. In this way, he questions the political structure and institutional background of the institutions designed to discipline and penalise offenders, which is an integral part of any modern national state. In Bertok's photographs, the inmates are presented with dignity, in the way they perceive themselves or they want to be perceived by the others, and not as delinquents or victims of the system. The details of prison architecture, in turn, reflects on the structure of centralised state systems, which define the limits of legal conduct as well as means of punishment when it is violated.