Top of the AAT hierarchies
....Styles and Periods Facet
............<styles and periods by general era>
................<three-age system>
............<styles and periods by region>
................African (continent)
................<The Americas>
................Asian
................<Early Western World>
................European
................<The Islamic World>
................Oceanic
................<international post-1945 styles and movements>
................Middle Eastern
............<generic styles and periods>