abstract appearance background bark color colored colors colour coloured colours cork cork tree exterior external impervious layers light resistant shadows soft sunlight sunshine surface textures tree trunk useful bad barrier bars black cage checks contrast dark design décor elegant fill floor geometric interiors net pattern scrapbooking screen seamless shapes squares texture tile wall white chaos complexity computer generated digital Fractal graphic illustration infinity mandelbrot mathematics repetition science self-similar self-similarity spiral technology wallpaper angles blowing blue blue sky branches breeze common focus foliage fronds leaves movement palm palm tree perspectives silhouette sun symmetrical wind art-glass artistic artistry blended bright circular coloration colorful colourful decorative distinctive glass lighting liquidy multicolored multicoloured patterned patterns raised shaped stained-glass style surfaced surfaces surfacing tactile textured thick thin vibrant window craftsmanship curved curves elephant lines round rounded blocks rectangles rectangular walled