When was the yellow rectangular border first introduced as National Geographic magazine's iconic visual trademark?

National Geographic has been bringing the natural world into our homes for over a century, becoming one of the most recognized brands in wildlife and environmental media. Its distinctive visual identity has helped establish it as an authority on natural science, exploration, and conservation. Test your knowledge about this iconic brand's signature design element that has adorned its magazines for generations.

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1888, with the very first issue of the magazine
1910, as part of a comprehensive redesign
1935, following the introduction of color photography to the magazine
1970, during a rebranding effort to appeal to younger audiences