And no, Im not decrying 'shrooms as an aid to looking at rock art. Take this panel http://news.bbc.co.uk/1/hi/scotland/tayside_and_central/8205035.stm
Dunno if the discoverer bloke was high but its a fact that if you are you realise the panel is four dimensional.... The 4th dimension is TIME. And thats important. The marks could have been added progressively over several thousand years so looking them as a whole may be looking at them wrong, and saying they are a star map or a spring map or whatever could be a big mistake, albeit understandable at first sight.
I got a bollocking from a bloke on Bodmin moor when I was drawing back the grass layer off a stone. I said don't worry I'm doing it very carefully and not damaging any archaeology. Archaeology? he said, I'm thinking of the insect life beneath it!!