At www.livescience.com/42126-spider-rock-art-discovered-in-egypt.html and www.livescience.com/42123-spider-rock-art-egypt-photos.html
The rock panel was found along a shallow sandstone wadi in the Kharga Oasis, 108 miles west of Luxnor – deep in the desert. The rock art may go back to 4000BC and its a matter of interpretation. You either see spiders or you don't. It could quite as easily be some kind of cosmic phenomenon, such as meteors.