Illusion (fiction) is the opposite of the concept of Reality. What a person defines as desirable, as opposed to what is actually there. It's nice to live in an illusion. It is convenient to live in an illusion. Illusion does not require effort, it "feeds" on new illusions. The illusion of intelligibility is self-deception in that the interlocutor's words are understandable to us, although we very rarely actually understand what the other person is trying to convey to us; groundless optimism – the illusion of future achievements in the absence of efforts in the present; the illusion of control – the belief that we can influence in our lives what we are not actually capable of; the illusion of asymmetric views – we overestimate the level of knowledge of other people about us (we know what we know about ourselves, but others do not); the illusion of extremity – the belief that at least someone should know what is happening; the illusion of clustering – the search for relationships even where there are none – this is a small list of illusions scientifically researched. And what can we say about everyday illusions - those with which it is convenient, profitable and pleasant to deceive. Here, for example: "he makes me angry" or "she doesn't understand me" are simple everyday examples of illusions that people live in to make their lives easier. After all, in reality you should say "I decided to break up with him, because this, in my opinion, will give me advantages in the future", or "it is convenient for me to explain all misunderstandings by the fact that she does not understand me, although, of course, in reality, I make little effort to make the understanding happen." The reality in which a person does not make an Effort is forced to build on an unreliable and shaky foundation of Illusions. And what illusions are you stuck in?