i still think abrasion holography is a fascinating and extremely underutilized phenomenon
amasci.com/amateur/holo1.html
you could create these kinds of patterns in all kinds of surfaces or constructs, and at all kinds of scales...
you could mechanically engrave holographic animated flames directly onto metal or plastic, burn it onto silicon with photolithography, or you could 3d print something that looks like a plate of spaghetti but someone's face pops out of it in the sunlight...

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and yes, of course, i've had the notion of a flame hologram engraved onto a sword blade in mind for years now

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