abstract apocalypse background bicycle bike black and white bumpy cross crossing desaster desert Dirt drive dry environment field gravel landscape lonely lost move navigate navigation nowhere orientation outdoor outdoors path pattern pedes plain push road rough scene single solo stone texture textures trail transport traversial view volcanic vulcano walk wheel wheels abundant aggregate appearance chips color colors colour colours decoration decorative filler filling garden gardening gray grey landscaping light milky-quartz paths pathways pebbles protective quartz rocks secure shaped shapes size Sizes slab solid stepping-stone stones strength strong surface surfaces terrain textured thick composition conglomerate contrast crack crystalline feldspar grain grained grains grainy granite grit gritty igneous-rock layered layers levels lines mica mineralogy minerals pitted rock rock-face rockface rocky rugged shape silicate stonework strata stratum wallpaper worked angles backdrop backgrounds barrier blocks constructed contrasts cracks discoloration fitted foundation foundational growth height high large limestone linear mortar moss old perspective perspectives plants retaining retaining-wall security variations variety wall walled well-built canyon colored coloring coloured colouring contours fissures flaws gorge natural ravine shade shadows small-canyon steep sunlight sunny sunshine walls