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How is this effect achieved?

https://imgur.com/c5fyRDp

(Original video:

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The instructor is just standing behind glass and writing on it.

| improve this answer | |
  • My handwriting isn't that neat when I'm in front of the writing surface, but, yeah, those look to be real dry erase markers. – Michael Liebman Jun 20 '19 at 1:02
  • Thanks for your response. If that was the case, then the writing should appear in reverse to us. So that's not what's happening. – thanks_in_advance Jun 20 '19 at 16:24
  • Or the instructor is writing in reverse, so it would look ok to us – TK-421 Jun 23 '19 at 13:22

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