 This is the book I was mentioning about the full wood construction. I've ordered one, so if somebody is interested, I can borrow this out. And it's about forestry, how to produce good wood with the moon faces, so the moon faces have a lot of consequence for the time where wood should be harvested, it should be in winter time before a new moon because then the wood is sort of having minimum of sugars and so on in the wood and it's a lot more long-lasting than normal wood.