Relating to a three-dimensional image created using laser light, or relating to something written entirely in someone's own handwriting.
From Greek holos meaning 'whole' and graphia meaning 'writing' or 'recording.' The term was originally used in law for documents written in one person's handwriting, then applied to the laser-created 3D images in the 1960s-70s.
A truly mind-bending property of holograms: if you break a holographic plate into pieces, each piece still contains the entire image, just at lower quality—it's the opposite of how normal photos work, where breaking them destroys the image. This property comes from how waves encode information across the entire surface.
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