Unit construction since its introduction has defined the development of the modern kitchen. Pre-manufactured modules, using mass manufacturing techniques developed during World War II, greatly brought down the cost of a kitchen. Units which are kept on the floor are called "floor units", "floor cabinets", or "base cabinets" on which a kitchen worktop – originally often formica and often now made of granite, marble, tile or wood – is placed. The units which are held on the wall for storage purposes are termed as "wall units" or "wall cabinets". In small areas of kitchen in an apartment, even a "tall storage unit" is available for effective storage. In cheaper brands, all cabinets are kept a uniform color, normally white, with interchangeable doors and accessories chosen by the customer to give a varied look. In more expensive brands, the cabinets are produced matching the doors' colors and finishes, for an older more bespoke look.
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