Art & Architecture Thesaurus
Design
Design
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The AAT is a [faceted classification](/wiki/Faceted_classification "Faceted classification") system as well as a hierarchical one. There are seven facets:

* Associated Concepts – [abstract concepts](/wiki/Abstract_concept "Abstract concept"), such as beauty, balance, connoisseurship, metaphor, freedom, socialism (Hierarchy: Associated concepts)
* Physical Attributes – perceptible or measurable characteristics such as size, shape, chemical properties, texture and hardness, such as strapwork, borders, round, waterlogged, brittleness. (Hierarchies: Attributes and Properties, Conditions and Effects, Design Elements, Color)
* Styles and Periods – stylistic groupings and distinct chronological periods, such as [French](/wiki/France "France"), Louis XIV, [Tang dynasty](/wiki/Tang_dynasty "Tang dynasty"), [Chippendale](/wiki/Thomas_Chippendale "Thomas Chippendale") (Hierarchy: Styles and Periods)
* Agents – people, groups of people, and organizations such as [printmakers](/wiki/Printmaker "Printmaker"), [landscape architects](/wiki/Landscape_architect "Landscape architect"), corporations, [religious orders](/wiki/Religious_order "Religious order"). (Hierarchies: People, Organizations)
* Activities – areas of endeavor, physical and mental actions or methods, such as [archaeology](/wiki/Archaeology "Archaeology"), [engineering](/wiki/Engineering "Engineering"), analyzing, contests, [exhibitions](/wiki/Art_exhibition "Art exhibition"), running, drawing (image\-making), [corrosion](/wiki/Corrosion "Corrosion"). (Hierarchies: Disciplines, Functions, Events, Physical and Mental Activities, Processes and Techniques)
* Materials – physical substances, such as iron, clay, adhesive, emulsifier, artificial ivory, [millwork](/wiki/Millwork_%28building_material%29 "Millwork (building material)"), nylon. (Hierarchy: Materials)
* Objects – objects either fabricated or given form by human activity, such as [paintings](/wiki/Painting "Painting"), [amphorae](/wiki/Amphora "Amphora"), [facades](/wiki/Facade "Facade"), [cathedrals](/wiki/Cathedral "Cathedral"), [Brewster Chairs](/wiki/Brewster_Chair "Brewster Chair"), [gardens](/wiki/Garden "Garden") (Hierarchies: Object Groupings and Systems, Object Genres, Components; Built Environment: Settlements and Landscapes, Built Complexes and Districts, Single Built Works, Open Spaces and Site Elements; Furnishings and Equipment: Furnishings, Costume, Tools and Equipment, Weapons and Ammunition, Measuring Devices, Containers, Sound Devices, Recreational Artifacts, Transportation Vehicles; Visual and Verbal Communication: Visual Works, Exchange Media, Information Forms)

How many styles and periods are there in the AAT system?