If you don’t keep newly created memory packages in some kind of order, but just keep them strewn haphazardly around in your head, you will find yourself  spending a very long time looking for them with a search light. Because next to this search light inside you get total darkness, so that we can concentrate on what the search light is directed at. Neurologists call this beam of light a Mexican hat. So it can’t be all that small and it has to let a certain amount in, if we are to place things closely together, nice and neat.

The great thing is: the brain can zoom in: if the entire framework of a theme with its most important bullet points is placed in full view to start with, no end of information is let into this field afterwards. Countless details will be in full view before our eyes as soon as we turn to the theme.
When we leaf through a book, and don’t have this overview in the framework in front of our eyes, then it’s possible that the next page we read slides into darkness within the brain, sometimes never to be seen again.
We then have to sift through the pages of the book, reading again and again what’s on one page and what’s on the other, as one page is plunged into darkness each time we read the next!

Unfortunately, the brain cannot leaf through pages. We have to sketch the entire context of a subject clearly on ONE sheet of paper in front of the eyes, otherwise the details are unavoidably lost.

The rule here is:
from the whole to the detail.