Holten initially had the idea for a tree alphabet when working on her 2015 book About Trees, published by Broken Dimanche Press.The compendium of tree-related writing, from Ursula K. Le Guin ...

In the process, he created a simple tree. Across the top of the page, he wrote, “I […] When Charles Darwin was thrashing out his theory of evolution, he would doodle sometimes in his notebooks.