What kind of lines are these? - the meticulous reader will ask. Plot-based? Behavior? Protection? Life lines on two author's hands, left and right? Or is it named after the St. Petersburg streets on Vasilyevsky Island? No, no. Just lines. Probably straight. So, in any case, his inner gaze tells the author, which is always right. And you now have in your hands one of these two lines, undoubtedly parallel. In some places, however, they overlap. But in the rest - no, as they taught in school. The thing is that both school Euclidean geometry and Lobachevsky’s paradoxical geometry are both right. Because a universe in which there is only one kind of truth is impossible. For technical reasons, as they say.