Post-Impressionism emerged in response to Impressionism, experimenting with form, color, and emotional/symbolic content over impressionistic realism. Artists like Van Gogh, Gauguin, and Cezanne pioneered expressive, non-realistic styles focusing on emotion, imagination, and the human condition. Cezanne's experimentation with form influenced Cubism, while Symbolists like Moreau and Redon conveyed modern psychological ideas. Rousseau brought a naïve style reflecting the unconscious mind. Overall, Post-Impressionism marked a shift from surface appearances to deeper subjective experiences.