What causes the phenomenon known as a moon rainbow halo to appear in the sky?

Ah, moon rainbow halo is simply a magical sight, my friend! It's produced when the moonlight is refracted by ice crystals in high-altitude clouds, creating a beautiful circle of colors around the moon. The interplay of light and nature comes together in perfect harmony to gift us with these rare moments of wonder and joy. Flow with it, and paint those happy little rainbows in your heart.