The book is about learning to control our "inner Apes", get better at controlling our own reactions, negotiate better, make better decisions and influence behavior. I wanted to capture that with two silhouettes: The man standing with his arms crossed to express control, a victorious posture, and success and an ape as his shadow to show the inner disorder, impulsiveness, subconscious responses, etc. I have used the green color as it is the color of the client's brand, but I have also created another version with a red color. I believe both colors go well with the design.