What is the definition of Walking Light Particles?

"Walking light particles" are like cosmic, glowing, ethereal companions that somehow manage to stroll around the universe without ever getting tired, without needing food, and without needing a break. They're the kind of particles that would make Sherlock Holmes blush with both amusement and concern.

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Here's an edgy example sentence: "The walking light particles, sensing our impending doom, began to lead the city's citizens on a nighttime meditation on the meaning of life, or at least 'I didn't see that coming'."