"Theatre under the flow of time" presents a set of views on the development of the National Theater Brno, which took place in the thirty years marked by the Velvet Revolution and the worldwide covid-19 pandemic. The collective of authors drew their knowledge from numerous archival sources and materials, and at the same time in many cases had the opportunity to rely on their own audience experience and the opinions of theater companions. The publication is provided with rich documentation and presents the observations of theater practitioners and theoreticians, interviews with creators and leading personalities of the Brno theater scene. Even after one hundred and fifty years of its existence, the National Theater is a mirror of the city, its cultural policy and especially the society from which generations of spectators were formed and are still being formed.