Ancient tribes very rarely painted anything that was not known to them. They would not have been able to conceive alien looking spaceships with landing legs on them because humanity hadn't developed the ability to cross over the water in ships during this period or would have at best been on the frontier of such discoveries.
Ancient tribes would have painted every day life events, hunting, tribe wars, burial ceremonies, etc. because such events would have been natural to them.
Seeing objects on a cave wall representing UFO objects however would not be a normally occurring daily event and would not have been marked as a ceremony regarding hunting, wars, burials, etc. but would have been marked in very unusual paintings that would not have fit in with the normal daily routines that were recorded on dirty little cave walls.
For some reason the number six whether sci-fi, religion or ancient cave drawings seems to be a norm. In religion 666 is meant to be the devil....possibly knowledge that was forbidden to us that might actually lead to ancient aliens on Earth and their locations in space that has otherwise been covered up with superstitions of the knowledge coming from the devil and therefore evil.
Something is telling me that 666 when it becomes 60, 60, 60 a perfect triangle might lead to some new knowledge.
My best guess would be to comb the stars looking for perfect alignments of 60,60,60 degrees to unlock a new discover.
Varek, your thoughts and ideas have been a part of some of the ideas and theories both here and on the old forums. So they are not rubbish nor have they gone....unlooked over. Is that even a word?