I thought I reply to this old thread purely to argue 1 point. I agree with everything you said apart from the last part where you state that infinity is jus a concept. Actually infinity can actually be a physical quantity . For example. The circumference of a circle is equal to pi . Pi is a number that goes on for infinity . Also when looking at fractual geometry of nature .it can be seen that the self similar pattern of a snow flake is preserved with an infinite perimeter on a finite surface.