Isn't that pretty much an accepted fact by now? There are colours we can't see, sounds we can't hear, energies we can't feel. The real, "unfiltered" world is quite unlike the one we live in...Or you have Kantian idealism which essentially says the same thing that we only know things through our sense and that the "actual" real world is far different from the way our sense experience it.
Then I think about higher dimensional beings that we only see partial aspects of. Like flatland. Or Douglas Adam's hyperintelligent pandimensional shades of the color blue. Or the H.P. Lovecraft quote "The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents. We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far. The sciences, each straining in its own direction, have hitherto harmed us little; but some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new dark age."