Flow
From A List Apart:

In web design, when we think about flow we usually think about “task flows” or “flow charts” but there’s another type of flow that we should keep in mind. It’s that feeling of complete absorption when you’re engaged in something you love to do without being disrupted by anxiety or boredom caused by tasks that are confusing, repetitive or overly taxing.

Flow, as a mental state, was first proposed by psychology professor Mihaly Csikszentmihalyi and is characterized by a distorted sense of time, a lack of self-consciousness, and complete engagement in the task at hand. Software engineers might feel it when they’re writing code, gamers might feel it when playing Guitar Hero III, Christopher Cross felt it when he went sailing. For designers, it’s exactly the feeling we hope to promote in the people who use our sites.

How do we create sites that inspire that feeling?

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