Why isn't the world you see, real?

What you see is an allusion?

    First let me explain that your eyes are like the lens of a camera. They simply filter and focus like the f-stop and other settings of the camera. Your brain takes what is received through the lens of the eyes and makes an interpretation of what it thinks the eyes are looking at. On top of that color is the biggest illusion of all. The white light that surrounds us is composed of all the colors we can imagine, each color resonating at its own wavelength. The white light strikes the Apple, but only the color of the Apple gets reflected back to the eyes. All the other colors are absorbed by the Apple.

So here's the question, if the Apple is nothing more than a reflective surface, what is the actual color?

If the color of the Apple was of a frequency beyond our perception, would the Apple be invisible?