Happiness arises when challenge and skill match perfectly
Csikszentmihalyi called flow that state where you forget time because you are fully absorbed in something, like a game, a drawing, or a sport. If the activity is too easy, you get bored; too hard, you get frustrated. Flow happens right where your skill matches the task's difficulty.
Why it matters The idea of flow is used today in video game design and education to keep attention engaged.