Swift Playgrounds is an incredible live programming experience. It's also one of the few apps exploring a tablet based IDE.
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I'm a huge fan of Swift's 'Error Handling Rationale' design document: https://github.com/swiftlang/swift/blob/9315673c003875158852579bd1f33480cdec5461/docs/ErrorHandlingRationale.md#fundamentals
It carefully defines terminology and compares with other languages, so you can understand Swift's position and preference in the design space.
I travelled recently with six electronic devices, and every single one used USB-C for charging. It was wonderful, and not an experience I've had before.
Exploring design ideas using AI as a learning assistant, for creative exploration: https://andymatuschak.org/hmwl/