abstract aging backgrounds broken brown built cement concrete cracked dirty effect grey grunge history level material non non-slip obsolete old process revival ridged rough slip stone street strip surface texture traction urban view wall weathered white wreck angles appearance backdrop background barrier blocks coloring colors colouring colours constructed foundation foundational growth high historic perspective perspectives plants secure security solid stones stonework strength strong surfaces textures variations variety well-built apartment building exterior Built Structure china city cityscape coach East Asia harbor High Up Hong Kong Industrial Ship island landscape landscapes nature Nautical Vessel non-urban scene. Residential Structure sailing ship scenics sea sky Travel Locations urban scene water craftsmanship creative decorative display gray groove grooved grooves lines walled colorful colourful ornamental