Diagonals. The world around us is not what it seems. Every fraction of a second, an amazing amount of information is being perceived by the five senses, passed on up through the nervous system, and simultaneously collated by the human brain. Electrical impulses from every which way. Absorbing nearly an "infinite" amount of data is no easy task, in fact it is pretty much impossible. The human brain is a complicated piece of living intelligence, but it has its limitations in size as well as processing speed. In order to get over this obstacle called infinity, in order to be able to survive in a constantly changing and unpredictable environment, the brain filters out what is necessary and interpolates in order to fill in the gaps. Just like an unfinished drawing from a coloring book in which the lines are evident. Must scribble in the interior afterwards with various colored crayons in order to make sense of it all. Not to mention the subconscious we all entertain to extrapolate, extrapolate.
Therefore. We perceive the outlines of reality. Nothing more, and alot less. And yes, this filtering process may break down at times, completely fail for the sake of clarity and swiftness of operation. Our thoughts create movement and/or objects that are not really there, partly there, partly not. Appear and disappear, tangle together and interweave. Have a look at the diagram at the beginning of this entry. They are diagonal lines which are parallel. Or are they? What is wrong? With me.
Conclusion. Most of what we see is filled in and non-existent. There is no reality except for the outlines. The shadows reflected on the walls of the cave as the real forms walk outside on the other side of the campfire to which our backs are turned. Real tables, Plato, real people, real sky, real trees, real ocean, real moon, real sun, real starry, starry night.