(http://club.alembicguitars.net/Images/2344/16986.jpg)
Great contrast with the densely packed straight grain at the center and the loosely spaced area for the wider part of the body.
That looks like a topographical map.
This looks like the back of my in vitro Further. I believe this is from the same piece I picked out. The photo doesn't do it justice, it is nothing short of spectacular in person.
Bill, tgo