Predella
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In art, a predella is the lowest part of an altarpiece, sometimes forming a platform or step, and the painting or sculpture along it, at the bottom of an altarpiece, sometimes with a single much large
Altarpiece by Carlo Crivelli, 1468. The predella has four scenes from the Passion of Christ. The predella runs along the base, framed below
Altarpiece with carved and painted predella at Marienkirche Stralsund, Germany.
Flemish altarpiece of the 1550s, still with three predella scenes
Polyptych
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A polyptych is a work of art which is divided into sections, or panels. Some definitions restrict "polyptych" to works with more than three sections: a diptych is a two-part work of art; a triptych is
Polyptych with Coronation of the Virgin and Saints by Cenni di Francesco, 1390s
Duccio di Buoninsegna, Polyptych no. 47 , 1315–1319, tempera and gold on wood, from the now lost church of the Hospital of Santa Maria della Scala in Siena, Siena, Pinacoteca Nazionale
Ghent Altarpiece Google Art Project
Ghent Altarpiece