abstract appearance Australian background bare bark brown colors colours cracked cracks dry edge edges eucalypt eucalypts gray grey layers lines mottled rough shadows shapes smooth sunlight surface texture textured textures tree tree-trunk trunk uneven variations wallpaper white wood black close-up grooves peeling tree trunk contours gnarled layered pattern patterned patterns shape shaped soft strips surfaces surfacing botany close closeup crack detail flora floral forest green lumber macro material natural nature old organic structure timber wooden cambodian pitted conifers cool dappled deciduous England english evergreen exercise Great Britain light path refreshing shade Surrey track trail trees walk woodland