4 ms·

Related, "abrasion holography", with great good success for being hand drawn: http://amasci.com/amateur/holo1.html http://amasci.com/amateur/holo1.html (1995)

• bradrn 2mo ago
  In fact, I believe that the article is describing a reinvention of this technique! Just with a plotter on oil rather than a compass on plastic.
  • Sardtok 2mo ago
    He did it on plastic CD cases, not oil. The oil in the beginning of the article was just for explaining the refraction that happens with the ridges in the structure.
    • bradrn 2mo ago
      Ah, whoops, thanks!
• evilduck 2mo ago
  Something tells me you didn't open the posted link.
  • nomel 2mo ago
    I guess I don't know how sharp a pick with an orange handle is from harbor freight, compared to a needle.
    • j6m8 2mo ago
      less!
• deleted 2mo ago
  [deleted]