I want to add that the feeling of deja vu relates to border zones as described in the image, we cannot imagine parallel realities with our 3D imagination and even 2D, it is like another dimension, it is not easy to explain. Regarding the understanding that parallel worlds exist and are connected, take a simple example of atoms and when moving away from the microworld to the macroworld, they all together form one thing, also parallel worlds when moving away can form something else, and specifically you in these parallel worlds when moving away can form your soul with only one spark among billions of you as your original part