abundance backgrounds beach bivalve colors colours damp edge edges forthy froth mollusc mollusk plentiful sand scallop seashells seashore shapes shells shore Sizes smooth sunlight surface surfaced surfaces texture textured textures types variety wet wet-sand advice alert appropriate behavior appropriate behaviour black care caution concern cutout danger dangerous directions emergencies emergency floor information isolated pictogram protect protection safety sign signs slip slippery slippery floor slippery surface slipping warn warning warning sign water wet floor wet surface white yellow drink drops sweat sweaty beer drainage flood residential road Surrey winter blue bubbles dew glass h2o