From a quick search:

https://www.instructables.com/The-Scribe-bot-a-Machine-to-Cr...

There’s a commenter on that Instructable who has some examples on his YouTube channel that he made from code he wrote to generate toolpaths (Holocraft): https://youtube.com/@CharlesVanNoland/videos

His blog is here: http://deftware.blogspot.com

The software: https://deftware.myshopify.com/products/holocraft

Guy at MIT made huge numbers of them, using a robot-arm and sharp tool. He worked out an algorithm to interleave the short scratch-segments, so dense intersecting scratches don't ruin the image. His art is now in a mathematics museum. Also, apparently he attempted to change the name of the holograms, pushing the term "Specular Holography" everywhere he could. Deeply silly, since they're not "specular," any more than is any other hologram. They possess a transmission mode and a reflection mode. If you scribe them in clear plastic, then you can either back-paint it black, and illuminate it from the viewers' side, or you can put a light source behind it, and see the same 3D image. The invention isn't inherently "specular."

So, wtf?

Heh, but also, knowing about the history of invention-theft and fights to name new phenomena, I'd earlier listed all the possible names I could imagine. Abrasion holograms, giant-fringe holograms, single-fringe holograms. Paleo holography, caveman holography, prehistoric holograhy, car-hood holograms, Geometrical holograms (geometrical, as opposed to Physical Optics.) Brushed-metal holograms. Chatoyant holograms (same optics as cats-eye gemstones, deep highlights in polished wood and human hair.) So, if you want to take the discovery as your own, you can't use any of my names!