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A foil is an architectural device based on a symmetrical rendering of leaf shapes, defined by overlapping circles that produce a series of cusps to make a lobe. Typically, the number of cusps can be three (''trefoil''), four (''quatrefoil'') or five (''cinquefoil''〔(Cinquefoil – Wiktionary )〕), or can be any number (''multifoil'').〔Pevsner, Nikolaus; Harris, John: ''The Buildings of England: Lincolnshire'', Penguin (1964); revised by Nicholas Antram (1989), Yale University Press, p. 726. ISBN 0300096208〕 Foil motifs may be used as part of the heads and tracery of window lights, complete windows themselves, the underside of arches, in heraldry, within panelling, and as part of any decorative or ornament device. Foil types are commonly found in Gothic and Islamic architecture. File:Trefoil-Architectural.svg|Trefoil File:Quatrefoil-Architectural.svg|Quatrefoil File:Chambers 1908 Cinquefoil.png|Cinquefoil File:Champagne-sur-Oise Notre-Dame-de-l’Assomption Triumphbogen 195.JPG|Multifoil (eighteen) ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Foil (architecture)」の詳細全文を読む スポンサード リンク
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