this post was submitted on 03 Jan 2025
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[Migrated, see pinned post] Casual Conversation
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Diffraction gratings because light is cool, and I like the pretty colors.
Not super modern but you can 3d print in a mold, or even make chocolate, and it will look "holographic." You don't add anything, you just manipulate the surface of the object to have tiny grooves with thickness in the nanometer range. Then light hits it and waves do their thing and we perceive a rainbow effect.
This is from a Reddit post, one of the top homemade "holographic chocolate" posts.
Wow that's cool!
If it's your thing, here's a full on deep dive into how 3d image holograms work. I'd never really appreciated how insane it is to encode a moveable 3d volume onto a 2d surface nor how early the maths for it was developed! (method 1948, first 3d image 1962, nobel prize 1971)
Presumably you could print a hologram-like portrait on chocolate, which blows my mind.