abstract appearance backgrounds bark bumps close-up colors colours cracks edge edges layers patterns ridges rough shades of colour smooth strips surface surfaces texture textured textures tree tree-trunk trunk uneven variations varieties wallpaper wood brown tree trunk cream folds mollusc mollusk pearly pitted ridge rim seashells shape shapes shell shells Sizes spiral spiraling spiralling turns twists types variety white angles architectural color colored colour coloured cover covered covering dark edging elements exterior external height high light lines perspectives protection protective roof roof-area roofing rooftop rows shade shadows sunlight sunshine tiles tiling wavy