autumn branch dry-rot fall forest fungal HDR leaf leafs November Nyberg october root Stump tree trees ancient Angkor angles appearance archaeological archaeology buddhism cambodia craftsmanship cultural culture damp decorative design encroaching encroachment features giant-spung-tree height heritage high Hinduism historical history intertwined jungle lichen monument mosses old ornamental perspectives Roots sculpted sculpture shaped spung-tree stones stonework surfaces Ta-Prohm temple temple-complex tetrameles-nudiflora textures thitpok weathered