Different tree different bark !

Going back to the tall straight tree to look at her bark. This set me wondering about lots of things...hmmm. Why is bark so different on different trees? How did it come to be so? Do all the varieties of the same kind of tree have the same bark? How many trees can I recognise by their bark? going to have a good reserch about bark later.... I have ell enjoyed the plaster of paris 3D creations- they look better than their photos but not as good as the real thing! If I were an embroiderer sewing bark patterns would be a fab project.....