angle angled architectural architecture empty escalator escalators exterior external floor height high inside interior levels long metal move movement moving narrow progress stair stairs steep step steps storey transport transportation UP angles appearance brown building CBD city colors colours dark decoration decorative design elements features gray green grey modern ornamental ornamentation perspectives Somber sombre surfaces walls adornments appearances art art deco black flat glass light linear lines modernistic patterns quality reflections straight style triangular windows zig-zags abstract background basic bricks color colored colour coloured large-bricks painted rough smooth solid standard strength surface texture textured textures wall wallpaper yellow brick-wall barrier corrugated corrugations galvanised galvanized multicolored multicoloured raised rounded strong variations brickwork curved curving edge edges edging going-up outside park paved paving upward advice announcement assistance carved communicating communication contrasting designed Designs detailed direction distinctive first-aid help informing lettering letters medical sign white wording words