Wu Wei
Any general interface should aim to achieve this feeling of Wu Wei. When this is done, it becomes so much easier for the user to achieve flow.
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Effortless action interfaces. Use just-in-time interfaces and ideas like spaced repetition to have technology truly feel like an extension of our minds, complementing the way we think naturally instead of requiring us to adapt to the technology. This is interesting for learning and productivity purposes, and especially so when we start considering what is possible with spatial interfaces blending with the natural spatial reasoning that our minds are already very good at.
This tweaking of the required effort to take certain actions is the key to the system. The interface should make the most important things to do the easiest things to do, making our action as effortless as possible. This is the key to what I call system design, and what devon zuegel calls incentive design.
A possible spaced everything product idea. The goal is to make as many things as possible feel like Effortless Action.
When faced with a choice, we have to understand that opportunity cost is a real cost. However, after a choice is made, we must try to free ourselves of the retroactive burden and move forward with acceptance and wu wei.