A whimsical clean cartoon illustration of 7 transparent ice cubes floating underwater against a vivid saturated blue background, each cube containing a cute pink brain character with oversized googly eyes and a small smiling mouth, as if the brains are frozen inside the cubes. Show the cubes drifting at different angles and depths in a loose vertical composition, with soft white highlights, glossy refraction, rounded cube edges, and a hand-drawn outlined look. Include many air bubbles of different sizes scattered throughout the scene, plus tiny white specks and soft splash-like dots to enhance the underwater feel. The brains should all have the same playful simplified design, bright pink color, black outlines, and expressive slightly goofy faces. Keep the style light, polished, and humorous, like a modern sticker illustration or cheerful editorial cartoon, with no text, no border, and a square composition.

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