"Composition of Red and White; Nom 1, Composition No. 4 with red and blue" is a 1938–42 painting by Dutch abstract artist Piet Mondrian (St. Louis Art Museum), featuring thick black lines, a white background, and blocks of primary colours (red, blue, yellow) in his signature Neoplastic style, representing a harmonious yet dynamic balance through geometric abstraction and a departure towards more improvisational elements inspired by New York's energy. 

Key Aspects:
Artist: Piet Mondrian.
Style: Neoplasticism (De Stijl), characterised by geometric abstraction, primary colours, and non-colours (black, white, grey).
Elements: Thick black lines form a grid, containing rectangles of pure red, blue, and yellow, set against a white canvas.
Harmony & Tension: Achieves a fundamental visual harmony through subtle asymmetry, with blocks of color and lines creating dynamic interplay.
Context: Painted after Mondrian moved to New York, incorporating more improvisational elements reflecting the vibrant urban environment.