Create an image of a whimsical underwater world where cats gracefully swim through swirling optical illusions, their fur shimmering with iridescent colors as they playfully chase schools of fish made up of tiny rainbows.

Imagine an enchanting underwater realm where felines have the ability to swim gracefully. They navigate through mesmerizing optical illusions that decorate the ocean floor. The cats' fur sparkles with dazzling, kaleidoscopic colors, reflecting the light in an array of radiant hues. They engage in a playful chase with schools of fish, each member of which seems to be composed of a myriad of tiny rainbows. The fish twirl and swirl, forming vibrant shoals that further enhance this delightful underwater scene.