Here is the theory, the core of the site. Everything else is an afterthought. I have tried to describe it as comprehensible, precise and imaginable as possible. English is not my native language and i am no writer, so bear with me. Contact me if You have questions.
This is a very tricky train of thoughts. Your mind might come with many arguments of why this can't be right. So far the counterarguments that my mind came up with turned out to be incorrect or less logical than this theory. If You think You have a clear reason as to why any of this isn't true or probable, then let me know.
With any take on truth You have to start somewhere. Without taking any chances or without making any assumption You simply have nothing to go on. And this very first step is also the weakest. There is no reasoning prior to reasoning, no justification for where You start. And even the most persistent theories that influence Your every day life and understanding started somewhere. No matter how long i think, life remains a mystery. But that doesn't mean we can't at least try.
Personally, i have chosen to start off with there being an experience. When i tried to deny everything, all the things that occurred to me seemed to be part of a greater thing, an experience. A very loud and busy experience, telling me many things. That i am a part of it. That i am sitting down in what is called a room. That i am thinking. And so on. All these ideas are very nice, but i didn't really feel comfortable just taking them all for granted again. My little escapade resulted in a few realizations and thus far i haven't found anything wrong about them. This is what my train of thoughts resulted in.
Anything that You can't see, hear, feel, taste, smell, think of, or otherwise experience is non existent to You. You can't know about it, You can't do anything with it, there is no way for You to perceive it or to talk about it, at that moment in time. You see, all You have to reason with, to do anything with, is Your full experience at any given moment in time. There is no reason to assume that there is an indirect experience. The experience itself is all there seems to be. Anything else is out of Your reach, impossible and pointless to discuss, since all that matters or can matter to You is a part of Your experience. And his is something You experience constantly. Every single moment. There is almost no denying it.
What You experience as being white is white to You, and that is all there is to it. What You honestly experience as being true is true. The way You experience is the only way the world turns, as far as You can know or act upon. As far as it can even matter. And if there is a way to change that full experience, or part of it, You might be able to change the world, or part of it.
Though, if we're being completely honest it's not about seeing, hearing, tasting, feeling or smelling at all. As when i see something and i know that it's not real i experience it as not being real. We call that an optical illusion. When i ask myself what kind of a world i am in, i answer with what i think i know. With what i believe to be so. Since i can question everything i know of, i'm not exactly fully certain of anything. I don't see, but i think i see. This means it all comes down to what You believe is true or not. That's all that Your experience consists of, and thus what equals the world. One doesn't cause the other, both Your way of thinking and the experience are the same thing. Through simply believing or even knowing something is true, it is true.
Of course at first You think that this can't be true, or won't be true, if this is not the way You are used to experiencing the world. During life You get the impression that You experience but a minuscule fraction of what is going on in this world. For example You noticed that there are other people experiencing different things than You do. They have different opinions, You make mistakes, they surprise You and they tell stories about things You never knew. Yet this whole idea of there being some kind of unknown, may just as well have been a part of Your experience. That You are not used to thinking this way does not make it less likely to be true.
In fact, no matter what view, logic, religion or beliefs You agree with and no matter how elaborate Your world views become, no matter the evidence You come up with to support them, i will always be able to draw a circle around that entire picture and state that it is nothing more or less, that it is exactly what You think of.
It is neigh impossible to find a more logical explanation of reality as this theory only assumes very little aside the existence of the experience we lend everything from. Not a whole unseen outside world or a universal truth with individual interpretations of this truth as seems to be the common belief. There has never been any sign that there is more to this world than Your current vision of it. As far as i can see (haha) the assumptions people currently make at school and in science, are in no way justified.
Ponder this: what good is a universal truth if You can't experience it as an individual?