barbed barrier danger fence grey keep out metal railings security sharp spikes top twisted wire animals brown caballus equus eyes ferus hair head horse nature poney pony rural saavem small angles appearance barred bars black closed confine confined contained contrast dark darkened decorated decorative gate grille historic iron light locked old sealed secure secured shade shadow solid strength strong sunlight wrought-iron abatis background bound cage defense encircle net netting night pattern texture trap white coloring colors colouring colours constructed dry-stone-hedge dry-stone-wall drystane-dyke fitted free-standing large local-stone patchwork perspectives random randomly-coursed rock-fence rocks rough rugged shaped shapes stone stone-fence stone-walled stones stonework sunshine surface surfaces textures uneven variations variety wall walled 3D abstract bond chain chainlink concept connection creation design detail fill garden graphic gray grid illustration industrial industry isolated line link metallic power prison rust safety steel symbol system together