Hellenistic mosaic glass bowl, cobalt blue with yellow/green spirals, fire-polished, with diameter of 5in (13 cm), dating from 2nd/3rd century BC. Convincing 3-D effect of spirals when seen in detail (at R). For details of the ancient technique, see https://t.co/aiINmGda4p pic.twitter.com/39bEN3uj0e
— Journal of Art in Society (@artinsociety) August 7, 2026
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