A Coffee Mug With Clear Text On It That Says 'Hello World'

This ceramic coffee mug displays a permanent, UV-reactive inscription reading "Hello World!" in clear, sans-serif font against a matte black background. Upon contact with direct sunlight or artificial light sources above 2500K, the text becomes faintly luminescent, serving as a subtle notification system for when someone's favorite beverage has reached optimal temperature. As users carry their morning coffee, the mug serves as a discreet yet charming conversational starter, subliminally hinting at the presence of an enthusiastic programmer nearby.