6 ms·

I love the idea, can anyone explain how it 'glows'?

• pja 11y ago
  Given that it reflects light back in the same direction as it comes in, I’d guess it’s based on the same principle as the 3M retro-reflective material (Scotchlite). Presumably it’s a suspension of either spherical beads or tiny corner reflectors (quartz crystals?).
• unfamiliar 11y ago
  It's reflective.