Clock Works is a prop set that builds that wonderful space behind the clock faces a top the clock tower. The set includes 3 clock face walls, 3 outer backdrops, a base with a lower gear chamber, the inner wood works , the top of the chamber and of course the Clock Works. Why so many parts? This way you load only what you need and you can be mixed and matched with other sets you have in your Library. The clock works alone makes a wonderful back drop for period work or industrial settings.