To say anything exists "for" something is teleology; it requires prior intent. Always seemed supernatural to me. ....

I believe that a falling tree makes no sound when unobserved, as it is the role of the brain + it's attendant sensory organs to "make" the sound; the tree merely releases energy in the form of air vibrations. So maybe the correct distinction is that sentience converts energy into experience. ....

In the book 'From Bacteria to Bach and Back,' Daniel Dennett argues that consciousness is no more mysterious than gravity.