It might not have a practical use, but the piece stands out because it complements a room’s decor, and gets your attention by creating excitement and not blending into the background.
What is considered an accent piece:
A chair with color and fabric that presents your style, lamps, large paintings, mirrors, chests, planters, multi size wall decors, baskets, ottomans, and trunks.
Small accent pieces add interest to your room. Choose pillows, bookends, vases and candles.

https://www.1stdibs.com/art/paintings/
https://www.potterybarn.com/m/products/

https://www.frontgate.com/corona-bench/
Small accent pieces can add color and texture to any room:
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