- Each language has their unique encoding of their language represented in pulses of light.
- Written text remains the same
- The light is beamed from the human head in 360 degrees when ever they communicate, visible for up to 1KM
- Instumental music still works, and people can still hear things, just not talk.
- People currenly alive will instantly know how to communicate with light in equivalent proficiency to their speech proficiency before the scenario happening, but everyone born from now on will have to learn from the adults.
Remember: Light cannot penetrate walls
This sounds extremely impractical. It’s like everyone can only yell at the top of their lungs. At least we can choose to focus on the person we’re interested in and ignore background “noise”. But someone trying to get our attention would be difficult. Now we can just call someone’s name from behind them. Something equivalent would be impossible.