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I guess he filmed through a pane of glass, and then flipped the video? It's trippy that he's physically writing backwards, but the text we see isn't reversed.

• archagon 5y ago
  We see the whiteboard text scrolling sometimes, though.
  • _hao 5y ago
    He clicked something below to trigger that. I think the pane he's using actually got moved, so potentially he has a couple lined up?
    • archagon 5y ago
      Hmm. The movement is definitely mechanical, and it definitely sounds like he's writing on a hard surface.
• throwuxiytayq 5y ago
  I'd like to point out that this also means that his t-shirt has the logo pre-flipped. What an absolute madlad.