my humps, my humps, my lovely neck lumps?!
Makes sense to me prostheta but I but my doctor says i have an overactive plausibility gland!
basically you cut through fibres and if they are under tension when the timber is straight and square you're going to get a shift of some sort the right choice in wood grain it will make it negligible that's my view i'm sure someone more knowledgable will correct me!