Don't conflate reality with perception, you'll go mad (or become a philosopher... same thing). We didn't even have proof of the mechanism that allowed mass to exist until the Higgs Boson was 'identified'. All matter is 99.999% empty space, but the nuclear force prevents things moving through it (unless you have no mass). The idea of frequency is part of the reason General Albert Stubblebine thought it was possible to train soldiers to walk through walls (why does nobody consider floors in that equation?). He retired soon after... As to perception, your mind makes most of it up. The majority of what you see is a convenient interpretation of things to allow you to function. If you had access to your subconscious you'd go mad (or be a philosopher).