in light of some of the recent and very interesting threads on this site, i have a question about flaws.
there are flaws that are flaws because they simply break "the rules". there are flaws that greviously detract from said trees (like 2-D trees - sorry bonsaial

), and there are flaws that compliment these same trees.
my question is about the last set of trees. what kind of flaws actually enhance the standing of a tree? are we just talking about things like
jin or hollows in the trunk? or is it something else - something that cant be quite described (a subtle break of the rules for instance)?
im quite serious about this question. what flaws in a specimen are acceptable?
jeff