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.

Our everyday, traditional ideas of reality are delusions which we spend substantial parts of our daily lives shoring up, even at the considerable risk of trying to force facts to fit our definition of reality instead of vice versa.

You cannot not communicate.

It is difficult to imagine how any behavior in the presence of another person can avoid being a communication of one's own view of the nature of one's relationship with that person and how it can fail to influence that person.

This is the secret of propaganda: To totally saturate the person, whom the propaganda wants to lay hold of, with the ideas of the propaganda, without him even noticing that he is being saturated.

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.

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.