The book is an integral part of the Matrex exhibition project. The volume consists of three parts, dedicated to the Matryoshka, the Matrex building and the Pyramid. In tracing the unconventional cultural histories of the Matryoshka and the Pyramid – in terms of shapes, principles, hierarchies, etc. – the book discovers their various interconnections. The book resembles a series of “postcards”, presenting various kinds of anecdotes, which can be taken independently or combined to form diverse narratives. The aim of these stories is to support the core part of the book, covering the concept, architecture and programme of the Matrex building. The first edition of the book presented at the exhibition, constituting a peculiar prototype of a future publication, which will be released on the completion of construction of the Matrex.