Once in a blue moon you might find a hollow log in which the tree has retained its inner sapling.
I've celebrated this with silver leaf and inlaid aluminium.
Coming from a man who likes to talk to the photo of himself as a six year old lad that hangs above his work bench, rest assured it's heartfelt.
I love to think of these forms inside every tree, and of course every human.
I find the Kanji like checks around two big knots fascinating, one of which is close to both 'big' and 'log'!