World is an illusion?

In many philosophical works we often find phrase that the outside world is an illusion. There's something right there in that phrase and it felt even without evidence. However, nowhere it's explained why? What part of this world is illusory, but what is real? What happens when we'll understand the unreality of the world? The walls become transparent? It will be possible to materialize things out of nothing? Maybe so, but it is not fundamental, it is possible side effects. The main thing is in another.

World is a scenery. Moreover, the scenery provided for all occasions for each person and for each moment of time. There is infinite space of sceneries, which appears only one set, which selected by any one person. The choice of this particular person is adjusted, so that the set of decorations of HIS world does not conflict with the choice of OTHER single people and communities. Therefore, desire does not fulfill immediately, and not so radically change everything all around - the world (as a combination of each of the people worlds) should "adapt" to agree all possible "conflicts of interest."

Even such a "fantastic" world is still not an illusion. So what is there illusory in it?

Taking certain outlook on life, forming views (complexes and stereotypes), we, in fact, invent your own world, creating its description. And the scenery fits to description. Invention the world - this is an illusion. Set in the theater - is also part of the illusion, everything is not for real, though scenery themselves are real. But in our own, in such a multidimensional world, Mega Theater, everything is not for real. We also write the scripts, play the roles...

The descriptions of the world that we live in today are quite narrow. There are several physical laws, but thousands of psychological constraints – that's framework of our world. Hence the set of scenarios of life is very limited. With some degree of approximation, human characters and their life paths can be placed in a little more than a dozen typical variations.

Therefore, the world is not an illusion, but an infinite reality. But the fundamental system of our views on the world is an illusion. And they will never be comprehensive, and, therefore, will be distorted. But to avoid getting stuck in development, we should always remember the illusory nature of the current world picture and the prospects for expanding our understanding (adoption) of new ones. And than, perhaps, all sorts of "miracles" will become a reality.