Living In Flow - The Secret Of Happiness (& Its Causes)
By Mihaly Csikszentmihalyi
2004
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Professor Mihaly Csikszentmihalyi, USA, one of the greatest psychologists of our time, pioneering researcher into the optimal experience or ‘flow’ and best-selling author of Flow: The classic work on how to achieve happiness

I strongly recommend you read his 2 masterpiece books: