"the almost across the board 21 degree tilt of Irish portal tomb capstones"....
That's intriguing. Are there any theories about why that should be? Is there anywhere where I can read more?
As I understand it, the early spirit levels weren't very accurate.
:-)#
...I'll get my coats (it's very cold so I have two).
Kammer x
It is kind of curious, but I don't think anyone has really gone into it too much.
Usually the angle is produced by having the portal stones higher that the chamber walls
Sometimes they did this:
http://www.themodernantiquarian.com/browse.php?site_id=1376
and sometimes they used the shape of the capstone to do it:
http://www.themodernantiquarian.com/browse.php?site_id=912