I work for a large accountancy firm(probably the smallest of the big 4) so I have a nice normal office - but I'm never there. Most of my clients have their mainframes and server farms in very large underground bunkers (I reckon the one I'm in now could fit 8 tennis courts, and the ceiling is about 50 feet above my head)

Many, many blinkenlichts and the ever present 50dB hum of hot swap redundant power supplies.