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I've always been fascinated by how sub surface laser engraving manages to get an image inside a solid block of glass without leaving a single scratch on the outside. It looks like a magic trick, honestly. You're holding this heavy, polished piece of crystal, and right in the middle of it—suspended in mid-air—is a perfectly detailed 3D model or a floating photograph. There's no seam, no entry point, and no way to touch the image itself. ...