cobble cobbles curves farmyard hard landscape hard landscaping hard surface pattern patterning patterns paving radiating stone stones texture textures background hard Mineral rock surface bark cracked cracks fissures palm protective rough tree abstract angled angles appearance basic color colour concrete curved curving external footpath gray grey grooved grooves ground hard-surface hard-surfacing lined lines mottled mottling outdoors outside path pavement perspectives streaked streaks surfaced surfaces textured variations