1000 years ago, an artist sat in front of a sandstone wall. You wonder what went through his mind (and I assume it was a 'he' as it was generally a shaman or the like).
Was he trying to touch spirituality; was he trying to leave a message; was it his magnum opus; was he a tagger?
My guess? He sat there, just like I am today, saying "Dammit, I just can't make it work....." So, if you're stuck on your project, remember, the more things change, the more they stay the same. Hopefully I can crest the creative hump and get busy creating!