It seems that the notions of Bishop Berkeley (whom Dr Johnson failed to refute by kicking a stone) have surfaced again as the concept of the "participatory universe", promoted by Wheeler and Pickering among others.
The proposal here is that the universe either does not exist, or remains in a state of "suspended existence", until observed.
This does not seem to me as far-fetched as it may appear, since on the 'Copenhagen Interpretation' the probability waveform of any material particle does not 'collapse' into actuality unless and until observed (Schrödinger's kitty-cat and all that); and the Copenhagen Interpretation itself seems to be supported by the experiments performed w.r.t. 'action at a distance' perfomed by Alain Aspect and others.
What, then, constitutes "observation"?
It must, surely, imply conscious experience and, specifically, that this must be undertaken by a non-material entity, since everything material involved in experimental observation (e.g. a microscope or a particle accelerator) is itself subject to quantum uncertainty and hence to similar "non-actuality until collapse."
Are there any known references here, and/or is this idea considered sound?