• cordlesslamp@lemmy.today
      link
      fedilink
      English
      arrow-up
      2
      ·
      edit-2
      10 months ago

      If it’s cardboard or paper, they could just fold it. Use something they can’t fold, like acrylic sheet or super brittle paper-like that would crumble or break if folded.

      What about using self-disappearing ink? LoL