The scheme is based on a hexagonal grid (which, for example, Kostya Konovalov used for
his scheme). Hexagons sound cooler and look more interesting than the standard 45° Beck grid. And besides, I rotated the hexagons in such a way that there are no horizontals in the scheme (it is extremely inconvenient to arrange stations horizontally).
The hexagon formed the basis for the shape of the stations, interchanges, and terminals, and ultimately the entire map.