The book is recommended by the Twitter and Square Cofounder, Jack Dorsey. I first knew the book from Y Combinator. It's written by the American Artist, Robert Henri. Jack said it's an inspiring book to teach him the process is as important as the result. This is particularly important in the painful startup life.
I am still reading the first chapter at this moment. The book is like the "Zen" of Art. Whether painting, music, writing or even tech, they are all art in different forms.
Everyone is practicing art in daily life.
Check it on Amazon:
The Art Spirit
Embodying the entire system of Robert Henri's teaching, The Art Spirit contains much valuable advice, critical comment, and inspiration to every student of the arts.