我们很少注意,木材也分阴和阳,现在拍卖市场一把古琴动辄几百万、几千万,2000多年前古人对制琴的桐木的习性就很有研究了,制琴时一定要分阴阳,背阴的地方是长得快,年轮宽,向阳的一面长得慢,年轮窄。背阴的地方吸水决,木材的比重就低。阳面长的慢,吸水慢。以前制琴背板,把桐木板泡水里,吸水快的肯定往下跑,翻过来它又下去了。以前古人做战车,要拿水泡,拿火烤,阴面 We seldom pay attention to the fact that the wood is also divided into yin and yang. At present, a lot of guqin in the auction market is at its best. Millions and tens of millions of people started to study the habits of paulownia trees more than 2,000 years ago. Yin and Yang, where the shade is growing fast, ring wide, sunny side grow slowly, ring narrow. Shady places water absorption, the proportion of wood is low. Yang long slow, slow water absorption. Before making piano backboard, the Paulownia board soaked in water, fast run fast certainly run down, turn over it and went on. Before the ancients to do the chariot, to get blisters, get the fire roasted, negative