abstract appearance background brown colored coloring colors coloured colouring colours conglomerate contours contrast contrasts cracks fissures flaws grit gritty layered layers levels light lines natural rock rock-face rockface rocky rough rugged shade shadows shape shaped shapes stone strata stratum sunlight sunny sunshine surface surfaces texture textured textures veins wallpaper blocks cracked silicate solid split strength angles garden-wall shades-of-color shades-of-colour wall close-up crack fissure granite mica breaking-through quartz ribbons shades of color shades of colour