Piet Mondrian's 'Composition 12 with Blue' exemplifies his signature style of neoplasticism, using geometric forms and primary colors to explore balance and harmony. The work features a grid of black lines and a solitary blue square, creating a sense of dynamic tension and rhythm. Mondrian's meticulous attention to form and simplicity elevated the abstract art movement, inviting viewers to see the beauty in reduced form and color—a hallmark of modern artistic expression.