CLIs are reified UIs: https://www.expressionsofchange.org/reification-of-interaction/
Interesting exploration of what properties a text interface provides, and what it means for computer interaction.
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Exploring design ideas using AI as a learning assistant, for creative exploration:
I'm surprised there are so few programming languages with a built-in database that you can query for facts about definitions.
For example, list all the functions that take three arguments.
We have self-hosting compilers, why not self-host code exploration APIs?
Excellent article on level design in games to encourage player exploration, and considering the movement motivations: