The key caps use LCD displays for all the vowels, so they can automatically adjust over the years to reflect ongoing vowel shifts while allowing you to keep typing phonetically.

"XKeyboarCD", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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The key caps use LCD displays for all the vowels, so they can automatically adjust over the years to reflect ongoing vowel shifts while allowing you to keep typing phonetically.