What is the definition of Selecting Light Particles?

"Sure, 'electing light particles' is like choosing the most colorful band members from a rock concert but with fewer people. You pick the ones that shine brightest, toss out the drabbers, and hope they still have a sparkle in their eyes (or maybe just their socks)."

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Now, here's a sentence that's definitely unsettling: "The psychic selected light particles to predict my next midnight snack choice, based on the cosmic alignment of my birthday and the last time I checked if my cat was wearing a neon vest."