Enjoyment appears at the boundary between boredom and anxiety, when the challenges are just balanced with the person’s capacity to act.

Mihaly Csikszentmihalyi Flow: The Psychology of Happiness

Mihaly Csikszentmihalyi Flow: The Psychology of Optimal Experience (Harper Perennial Modern Classics)

Mihaly Csikszentmihalyi Flow: The Psychology of Optimal Experience (Harper Perennial Modern Classics)

Mihaly Csikszentmihalyi Flow: The Psychology of Optimal Experience (Harper Perennial Modern Classics)

Daniel Kahneman Thinking, Fast and Slow

Daniel Kahneman Thinking, Fast and Slow

Steven Kotler The Art of Impossible