An intellectual journey through the symbolic heritage of humanity. The lecture "Tree Structures" is part of the author's cycle by Viktor Troitsky, Senior Researcher at the House of Losev, titled "Contemplation in Forms" and is dedicated to one of the fundamental symbolic forms - the tree. This image has served as a universal model of the world's structure since ancient times: with roots going deep into the archaic, a trunk symbolizing stability and tradition, and branches reaching towards interpretations and development. The lecture will provide an overview of cultural, philosophical, and scientific approaches to understanding the tree: from Babylonian mythology to modern language theory, from visual metaphors in art to formal logical structures. The lecturer will also examine the tree as a form of description - for example, genealogy, classification, semantic development, and even philosophical categories. Special emphasis will be placed on the ideas of non-classical logic and symbolism related to the works of Pavel Florensky, as well as on the method of "mathematics for humanities". Where to go in Moscow, knows KudaGo.