This instructional text investigates the core question of how to move beyond literal representation to capture the essence and atmosphere of a subject through watercolor painting. John Blockley, a renowned British watercolorist, utilizes his extensive experience in landscape and still-life painting to provide a framework for interpreting light, texture, and form. The book presents a methodology focused on personal expression, encouraging artists to prioritize individual perception over rigid technical adherence.

The text is regarded as a foundational resource for intermediate painters seeking to refine their interpretive skills and move away from purely illustrative work. Its focus on the philosophy of observation makes it a respected manual for those interested in the expressive potential of the watercolor medium.