The authors of this book - philologists, philosophers, theater scholars, cultural experts and historians - are united by their participation over the years in the work of the Moscow independent research laboratory Theatrum Mundi, which was founded in 2017 by Maria Neklyudova and Yulia Liderman. In the texts of this collection, in the broad context of modern humanitarian theory, various forms of existence of modern theater are analyzed - from performance to modern dance. The articles included in the book give readers the opportunity to get an idea of both the fundamental concepts of the modern theory of performative arts (the politics of spectatorship, theatricality, affect, etc.), and the various possibilities of their use in humanitarian research. The publishing design is preserved in PDF A4 format.