Book in categories:

The New Drawing on the Right Side of the Brain

Comments and mentions from HN threads:

Ask HN: What books changed the way you think about almost everything?

Wistar: It made me realize that I am more creatively skilled than I thought I was — a realization which has enhanced my life greatly. To some lesser degree The Artist's Way has influenced me as well.

Ask HN: Books that change your way of thinking?

bo_Olean: This book could/will change the way we see things. Not only for drawing or art, principles from the book can be applied to any creative profession.