abstract background block brown colored coloring colors coloured colouring colours contours contrast cracks edged edges edging fissures flaws heavy large layered layers levels light lines natural red rock rock-face rockface rough rugged shadow shape shapes solid split stone strata stratum strength sunlight surface surfaces texture textured textures variations wallpaper backdrop barrier contrasting decorative display distinctive divide dividing-fence dried dry fence fences fencing hard joined joins linked ornamental screen screened screening sticks straight strong surfaced surfacing upright variety weather- resistant wired wired-together appearance conglomerate contrasts grit gritty rocky shade shadows shaped sunny sunshine veins mica silicate