0. Introduction (how is a subject created?)

0 – 1. There are two different worlds: the world that we perceive and the world that we conceive, or the external world and the internal world. What are the differences between them?

First of all, the existence of an image is not depended on the corresponding object. Imagine that you saw a wonderful flower. After a year, you could remember it, but the real flower might be completely decayed. So it would exist in your mind, but not in the real world.

Secondly, our brain pays attention to details as much as needed. It doesn't deal with unimportant pieces of information because they are not needed to be processed. So if the flower had 10 petals, our brain would probably store a bunch of petals. The brain might memorize the number of petals for a short period, but it would forget it after a while, if it weren't that significant.

Thirdly, the image is processed on and off by our brain (frequency of process depends on its importance), and it's enriched by our feelings, beliefs, notions and occurrences. The image of the flower might remind you of a very memorable day when you had a lot of fun, so when you remember the flower, you'd feel happier. The imaginary flower would do so, not the real one.

And the last but not the least difference is the limitation which has characterized the real world unlike our imagination in which we can do whatever we want: our mind can disintegrate the elements of an image and combine with other images. Sphinx, unicorn, mermaid and many imaginary characters in mythologies or fairy-tale prove the ability of our brain to mix several things up in order to create a new creature which doesn't exist in the real world.

In conclusion, image, though its raw material is reality, is processed in our mind so the outcome is not the same as real object.

In philosophy, image of any object created in our mind is called subject.

In mathematics we move from objects to subjects frequently which we’ll discuss how it happens, through the next posts.