I don't have reliable information about a specific artwork titled "Cosmos 4" by Eduardo Arranz-Bravo in my training data. While Arranz-Bravo is a recognized contemporary Spanish artist known for mixed media work that often explores abstraction and gestural mark making, I cannot provide accurate details about this particular piece without risking factual errors. I'd recommend consulting museum collections, the artist's official documentation, or verified art databases for accurate information about this work.