The grain orientation is convention:- ideally the grain should slant down to the front of the atasan, but sometimes the material itself prevents this.
If we use the philosophical interpretation of "why?", it is because a forward slant indicates progression & a positive feeling, a slant towards the back generates a negative feeling.
If we use the Surakarta pakem, dhapur is Jalak Ngore.
I'd prefer to leave pamor comment out of it, there are too many ways to go.
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