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Is that Ralph Wiggum in the bottom right?
https://www.metmuseum.org/art/collection/search/558852
A mosaic glass technique allowed multiples of an image to be created: a figural or design composition was made by bundling colored glass canes, which were then drawn out into a long bar. The bar was then sectioned at right angles, probably by striking the bar with appropriate tools, to produce small inlay tiles. The tile would then be smoothed and polished on the face intended to appear outwards.
Yeah, that makes sense
Sounds exactly like how they make image candy, like at Lofty Pursuits!
So basically the same technique as a stick of rock