You're right there, Fiz! Defining reality is, by far, the trickiest part of our reality, and is only second in reality to the conclusion which Descartes came up with centuries ago.
There are times that I do find comfort in the simplicity of just living day to day, while trying to ignore the very real possibility that what we think is real, really isn't real at all.
I've been fortunate in that regard to not have many experiences with dreams that seem too real. Nor have I been burdened with psychiatric problems or psychic experiences that could serve to complicate my three-dimensional definition of reality.
On the other hand, I also find some discomfort in sensing, somehow, that there is something out there that I cannot see, hear, taste, touch, or feel. So, it seems ironic that I find reassurance in knowing that modern scientists are beginning to suspect the same thing, and that they may, somehow, be able to prove that there are still more realities (dimensions) to discover.
It is a double-edged "sword of Damocles" that seems to hang over our heads -- poised to cut in either direction. On the one hand, we are threatened by it; and, on the other hand, we are hoping that it will free us from ignorance.
As you say, finding our reality may disprove that there is such a thing as reality; and reality may be just an illusion created by yet another reality in succession -- a "virtual" reality inside another, and yet another, and so on.
I'm sure you would agree, however, that discovering each successive reality would be like pursuing an interesting detective story. While seeming to be a frustrating endeavor, it can also be a great deal of fun; because, after all, isn't the process more rewarding than achieving the objective?
-Nightrain
