(3D printing) Darwin’s Cladogram Tree with Finches, by Joaquin Baldwin:
"Charles Darwin’s first ever sketch of a tree of life, in the shape of an actual tree, with finches perched on the branches. Each branch and minute detail of Darwin’s original drawing is represented, and each finch represents the A, B, C and D marks on his sketch. The sketch appeared in his private notebook (“Notebook B on the transmutation of species,” 1837–1838).
If you look carefully, you’ll notice that each finch is slightly different, and the more apart they are from each other in the evolutionary tree, the more distinct the differences are.”