Dear Natalie, the original picture comes from the book, flow: the psychology of optimum experience. For more convenience, you can use the following image which is explicitly marked for reuse:
Productivity is My Passion | Programmer. I Read Obsessively, Experiment Like a Maniac, And Write The Best Practices @ https://livelikepros.com
Productivity is My Passion | Programmer. I Read Obsessively, Experiment Like a Maniac, And Write The Best Practices @ https://livelikepros.com
