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The world is full of icons that warn us to be afraid — to stay away from this or not do that. And many of these are easy to understand because they represent something recognizable, like a fire, or a person slipping on a wet floor. But some concepts are hard to communicate visually, especially in a way that will work for generations to come. 99% Invisible teamed up with Vox to bring you this video about the challenges designers face in developing warning symbols that last.

Check out all of Vox’s videos. They’re top drawer.

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VIDEO- Why Danger Symbols Can't Last Forever with Vox

99% Invisible

VIDEO- Why Danger Symbols Can't Last Forever with Vox