In-sane

For this next bit play along with me. I propose a few trips in the world of imagination you can muster.

Imagine a world where the ground is a mirror. You have only one sense, the sense of sight. You cannot touch, hear, taste or feel heat etc. All you can do is see. In such a world everything will appear dual. One above the 'ground' and one below. The question then arises, how would you distinguish image from object? How would you decide what is real?

Is the sun above or the one below real? Are you an image or the one below you? How would you know that the other guy does not have thoughts and feelings? If at all how do you decide that you are in control and not merely the reflection of whatever the other guy does?

I think in such a world one cannot distinguish what is real and what is not. Thoughts are welcome in the comments.