
What is a triptych?
A triptych is an artwork divided into three sections or panels, often hinged together, allowing it to be displayed open or folded shut. It is a type of polyptych, a term for multi-panel artworks. Typically, the central panel is the largest, flanked by two smaller panels, although some triptychs have panels of equal size. Triptychs have been historically significant in religious art but are also used in contemporary works.
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Etching is a technique where a design is created on a metal surface by using a strong acid or mordant to eat away the unprotected parts of the metal, leaving the desired pattern in relief (intaglio). In modern art and manufacturing, different chemicals may be used depending on the material being etched.

Hard Edge art is a style of abstract painting that became popular in the 1960s. It features areas of color separated by crisp, sharp edges that are painted with geometric precision. The term hard-edge painting was coined by art critic Jules Langsner to describe this approach, which contrasts with the softer, more fluid forms of other abstract styles.
