The main question with regard to megalithic art (petroglyphs from neolithic times) is of course; what does it mean? Lots of books are discussing this subject, like the book The stars and the stones of M. Brennan and the book Irish symbols of 3500 BC of N.L. Thomas
It seems that the buildings (like Newgrange,
Knowth,
Loughcrew,
etc.) which have art on its stones, could be aligned to mark some
important
moments in the year. Possibly like a kind of calendar (remember there
were
then no clocks, agenda's and others means to mark time). So these
buildings
were perhaps used as big
sundials and/or libraries of knowledge.
The pictures carved in the stones (petroglyphs) that make the walls,
could indicate towards astronomical knowledge. But the question still
remains
what knowledge do these pictures precisely represent, if they represent
knowledge!
To help generate ideas, please look at the ideas of the below
mentioned
people (in order of publication date, more books on this subject are
listed
in my virtual library). The definition
of
terms used within my web site can be found on this
page.
It are summaries (so made under my own responsibility) of some books
on megalithic art. The summaries look at: motifs, symbols,
alignments/directions,
calendars, interesting issues, questions to authors, etc. Myths are not
yet covered in the summaries (which could of course be important for
understanding
the art)!
My ideas, partially made up from the above ideas, can be
found
on this page.