Well, one thing that struck me when I was reading it was when you talked about seeing light vs. feeling it, in the form of heat. Wouldn\'t light and heat be independent of eachother? I mean, something can be incredible hot, and not be something we can see. If you\'re walking around in a dark room, and you step on a recently heated piece of steel or something, you\'d feel it without seeing it. At the same time, with things like LED\'s, relatively high amounts of light can be emitted with relatively low amounts of heat. I probably am missing something here, but I just thought I\'d point that out. I suppose they would be related, at least from the knowledge that I have based on my limited knowledge of different sciences, but they don\'t seem to be directly related enough to say that heat is like a way of feeling light.
I guess the reasoning you gave makes sense to me on some level, but it also seems like there are other things you can feel, but can\'t see. For example, say you have a stereo. You turn the volume up, and have the bass on really high. You can feel the bass, but you can\'t see it. I guess sound in general would be an example. I mean, we can feel sound. Otherwise, we couldn\'t hear it. However, we can\'t see it. There seems like there are just a lot of examples of things you can feel, but can\'t see...too many to just grab gravity out as one of these things, and make such an assumption. Then again, it is quite possible that you have more thinking behind this, or I just missed something. *shrug*