The vertex consists of a series of vivid images that contain the core. The physicality of the images isn’t 100% clear. For example, the country isn’t clear and I don’t know how old I am.
But they are vivid. For example, the warm sunshine and the breeziness of the clothes. Depending on the scene, there is the smell of shared breakfast and coffee, much green, or the ocean. Also, laughter.
And as to time: I did shave my head in May. ☺️ In all the vertex images, my hair is at least shoulder length. In some images, it is waist-length again, like it used to be. So, I guess the time of occurrence of each of the vertex images (wow, so many “of”s!) will depend on how fast my hair grows.