Capture the raw emotion and intensity of Expressionism in a mesmerizing artwork titled "666." The canvas pulsates with a chaotic energy, as swirling, vibrant colors clash and meld together in a frenzied dance of darkness and light. Jagged, bold brushstrokes carve deep, emotional grooves into the fabric of the painting, conveying a sense of inner turmoil and existential angst. The central motif, the number "666," looms ominously in the foreground, its stark, black silhouette cutting through the tumultuous sea of color like a blade. The background is a maelstrom of conflicting hues and textures, evoking a sense of unease and foreboding. The overall atmosphere is one of intense emotion, turmoil, and a hint of underlying darkness that beckons the viewer to delve deeper into the depths of the human psyche.