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Davinci pointed out that a tree’s thickness is constant if you slice it in a semi circle. https://fractalfoundation.org/OFC/leonardotree1.jpg https://fractalfou
by shawn 8y ago
Davinci pointed out that a tree’s thickness is constant if you slice it in a semi circle. https://fractalfoundation.org/OFC/leonardotree1.jpg https://fractalfoundation.org/OFC/leonardotree1.jpg
That is, if you face a tree and draw a circle with your arm, and add up all the thicknesses your fingers intersect, the total will always be the same.
https://www.insidescience.org/news/uncovering-da-vincis-rule-trees https://www.insidescience.org/news/uncovering-da-vincis-rule...
- sampo 8y agoIn forestry, they teach that as "pipe model". I am unable to track down how long that observation has been known in forestry, but I found this 1964 paper that attempts to build on the observation (already known in 1964) and build a theory. https://www.ncbi.nlm.nih.gov/pubmed/29370362 https://www.ncbi.nlm.nih.gov/pubmed/29370362 The modern understanding is that the pipe model holds only approximately.
- sampo 8y agoIt's kinda nice, how you can take a bunch of metal wires to make a tree trunk, and start separating them and folding them into branches, and separating and folding into smaller branches, and this can give pretty realistic looking trees. https://diyjoy.com/wp-content/uploads/2016/06/WireTree.jpg https://diyjoy.com/wp-content/uploads/2016/06/WireTree.jpg https://www.thisiscolossal.com/2014/10/dense-wire-tree-sculptures-by-clive-maddison/ https://www.thisiscolossal.com/2014/10/dense-wire-tree-sculp... https://www.youtube.com/watch?v=g0tj_ZLpv80 https://www.youtube.com/watch?v=g0tj_ZLpv80
- icc97 8y agoThat second link you gave puts it very well: > In other words, if a tree’s branches were folded upward and squeezed together, the tree would look like one big trunk with the same thickness from top to bottom. Absolutely fascinating!