Gribbin (1990: 160-1):
Today the key features of the Copenhagen interpretation can be more easily explained, and understood, in terms of what happens when a scientist makes an experimental observation. First, we have to accept that the very act of observing a thing changes it, and that we, the observers, are in a very real sense part of the experiment — there is no clockwork that ticks away regardless of whether we look at it or not.
From the perspective of Systemic Functional Linguistic theory, the observer is part of the experiment in the sense that it is the observer that construes the experience as meaning. No observer, no construal of experience — as particles, as time etc. The Copenhagen interpretation of quantum physics is consistent with the SFL distinction between experience and meaning, and the view that meaning is immanent within semiotic systems rather than transcendent of them.