perennial elm grows in the courtyard with multi-storey buildings. on the trunk of the tree are visible influxes, swirls and nests

aging bark biology branches change contrast corrosion daylight decay deep development elderly elm evolution fracture generation good grow grows highlight hole hollow illumination improvement increase large last lighting lit mature nest opening perennial process pruning relief rip rise sagging shiny shoots sink stands sunbeam sunburst sunshine texture trunk twig unique weaving yard year