what does watzlawoick mean " our everyday, tradional ideas of reality are delusions?

which we spend sbstantial parts of or lives shoring p, even at the risk of trying to force facts to fit or definition of reality instead of vise versa. and the most dangeros elsion of all is that there is only one reality. what there are, in fact, are many different versions of reality, some of which are contradictory and not reflectons of eternal, objective truth."