black black on white direction law no alternative one way one way signs only sign signs specific street signs white black-on-white communicating communication directional humor humorous humour indication lane laneway name nomenclature street-name street-sign unusual arches background basket container Designs gaps grill lines patterns plastic radiating shapes textures white on black black and white composition blackand white coffee coffee cup coffee on table composition contrast minimal monocrome sharpness gray grey left-turn no-alternative pointer pointing reflective traffic traffic-flow traffic-sign vehicles vehicular wording abstract career climbing element groningen hold-on railing safety shape stair stairs vector arrow one-way one-way-signs acrobat circus height high human shadow silhouette stilt stilts tall walk walk on stilts woman