@Olivier5,
"You" or "I" just like anything else is a concept, a cultural "social construct", or better a cultural "artefact" that flows from experiencing with a pov a frame of reference. That which "we" naively call the "I"...Whatever and in what form Experiencing "materializes" here n there with different povs flowing from the Whole is irrelevant to the fact EXPERIENCING itself cannot be Universally denied as first order Reality without dissolving and denying the very epistemic problem we raised. In simple form, that is to mean, you cannot say Reality is an illusion is Real...its a contradiction in terms...something has to give somewhere.
If Experiencing itself was a construct, an illusion of some sort, then epistemic problems would not validly exist. This in turn REQUIRES LOGICALLY one cannot deny experience without unravelling and completely dissolving the epistemic problem itself.
We may debate all the afternoon whether the "I think therefore I am" of Descartes is a complete account of the problem...its pointless as the "I" is as mysterious as anything else....Jumping to an upper level of reasoning we have to stick with something that goes beyond the multiple perceptions of "I's" and self identities...we stick with experience. Experience is the World.
In that sense we come full circle back to Realism again with a small twist. Reality being whatever it is, even if beyond our epistemic limitations is nonetheless True in the same way a true illusion is still an experienced FACTUAL illusion. The phenomena is happening. While you cannot finger where it fits in the order of things because its "illusory" you CAN nonetheless say its occurring and in itself is a pov with validity of existence.
If I dream of a flying pink elephant then its true I dream of a flying pink elephant.