building conveniences gender hers his ladies and gents loos public public conveniences public toilet signs structure toilet WCs ladies-and-gents public-conveniences public-toilet shape shaped shapes stand-alone style handicapped parents-change-room sign symbols wheelchair-dependent bush construction isolated wood wooden arranged available blue contained decorated decorative doors essential event-preparation fiberglass fibreglass function in-use lockable molded moulded moveable outdoors portable public-toilets structures surface surfaces surfacing toilets appearance communicating communication concrete convenience direction door gender-specific indication ladies narrow painted rocks texture textured textures thick thin wall walls wc women