No problem~!
3,000?! That's probably more than I would take in a couple decades...
I never thought much about sidewalks...I usually just think of them as grey slabs of concrete that people step on...but photographers like you must find (and know) about things normal people or artists (I guess everyone could be if they really set their mind to it) don't really care to think about. While photographers find beauty in their world, their minds, inspiration, emotions, (and God) artists rely on other artists for the most part? Oh, wow, that was sappy and didn't relate to what you said at all...
But, still, i'll keep that in mind!