Final answer:
Kandinskii's "colors of the spirit" refers to the concept that color directly influences the human soul, causing spiritual vibrations and emotional responses, an idea embraced in Post-Impressionism and reflected in the sociocultural symbolism discussed by W.E.B. Du Bois.
Step-by-step explanation:
When Kandinskii refers to the "colors of the spirit", he indicates that color has a direct impact on the human soul, creating spiritual vibrations beyond superficial aesthetic appeal. This suggests that colors can evoke emotional responses, signifying a fundamental connection between our sensory perceptions and our inner emotional states. Kandinskii's view aligns with the broader Post-Impressionist movement, as exemplified by artists like Gauguin and van Gogh, who believed in the evocative power of color to express complex emotions and concepts. W.E.B. Du Bois in "The Souls of Black Folk" touches on the deep significance of color, particularly within the context of racial identity and the experience of African Americans at the turn of the Twentieth Century, adding a sociocultural dimension to the conversation on color's impact on the soul.