abstract angled angles appearance background color colour concrete crazy-paving Designs detailed detailing distinctive footpath gaps grooves ground haphazard hard-surface hard-surfacing irregular level light mortar outdoors path patterns pavement pavers paving rough shaped shapes size Sizes smooth stones stonework surface surfaces textured textures uneven brown colored coloring colors coloured colouring colours conglomerate contours contrast contrasts cracks fissures flaws grit gritty layered layers levels lines natural rock rock-face rockface rocky rugged shade shadows shape stone strata stratum sunlight sunny sunshine texture veins wallpaper mica silicate