A bubblegram (also known as ‘laser crystal,’ ‘3D crystal engraving,’ or ‘vitrography’) is a solid block of transparent plastic that has been exposed to intersecting laser beams in appropriately to induce a chemical reaction via heat or photonic excitation, creating bubbles or nodes where the plastic has a different index of refraction.
A complex or highly detailed image occupying a 5 cm cubic volume typically requires the creation of tens of thousands of such points.
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The Daily Omnivore 