That we do not discover reality but rather invent it is quite shocking for many people. And the shocking part about it - according to the concept of radical constructivism - is that the only thing we can ever know about the real reality (if it even exists) is what it is not. It is only with the collapse of our constructions of reality that we first discover that the world is not the way we imagine.

Man never ceases to seek knowledge about the objects of his experiences, to understand their meaning for his existence and to react to them according to his understanding. Finally, out of the sum total of the meanings that he has deduced from his contacts with numerous single objects of his environment there grows a unified view of the world into which he finds himself "thrown" (to use an existentialist term again) and this view is of the third order.

For an answer which cannot be expressed the question too cannot be expressed. The riddle does not exist.

You cannot not communicate. Every behavior is a kind of communication. Because behavior does not have a counterpart (there is no anti-behavior), it is not possible not to communicate.

But the solution to the riddle of life and space and time lies outside space and time. For, as it should be abundantly clear by now, nothing inside a frame can state, or even ask, anything about that frame. The solution, then, is not the finding of an answer to the riddle of existence, but the realization that there is no riddle. This is the essence of the beautiful, almost Zen Buddhist closing sentences of the Tracticus: "For an answer which cannot be expressed the question too cannot be expressed. The riddle does not exist."

Radical constructivism, thus, is radical because it breaks with convention and develops a theory of knowledge in which knowledge does not reflect an 'objective' ontological reality.

As I have already said, the belief that one's own view of reality is the only reality is the most dangerous or all delusions. It becomes still more dangerous if it is coupled with the missionary zeal to enlighten the rest of the world, whether the rest of the world wishes to be enlightened or not. To refuse to embrace wholeheartedly a particular definition of reality, to dare to see the world differently can become a "think crime" in a truly Orwellian sense as we get steadily closer to 1984.