Mask of Vaikuntha Vishnu, late 5th century. Learn more about 5th century masks
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In architecture, a wide slab at the top of a load-bearing column, forming the uppermost section of the capital and helping transfer the weight of the supported beam or arch to the column’s shaft. In freestanding columns the abacus may be mounted with decorative or emblematic sculptures. From the Ancient Greek ábax, meaning ‘slab’.