abstract appearance background breaking-through brown colored coloring colors coloured colouring colours contours contrast contrasts cracked cracks fissures flaws layers levels light lines natural quartz ribbons rock rock-face rockface rough rugged shade shades of color shades of colour stone strata stratum sunlight surface surfaces texture textured textures veins wallpaper architectural barrier blended blue brick-wall color colour contoutred dark decorative design details edges fitted green interconnected interlinked intricate patterned patterns perspectives rectangles rectangular shape shaped shapes style surfaced thick thin tiled tiles variations various vibrant wall bright colorful colourful connected curls curly geometric geometrical interwoven joined linear lined map mapping parts red round rounded stylistic twirls twirly 3D art backdrop bulge bump cage contour curve decoration depth diamond distort form graphic grid illustration infinity mosaic op-art optical pattern pink pop art relief row sci-fi science fiction space square time twist vasareli vector walls warp weave yellow vasarely white aqua angles backgrounds blocks constructed discoloration large lichen limestone mortar moss perspective secure security solid stones stonework strength strong variety walled well-built canyon gorge layered ravine rocks rocky shadows small-canyon steep sunny sunshine