The keys are made of a specific materail so it acts as a transmissive medium, which is like poor mans fibre optic. The earlier prototypes were CNC'd keys, with

The keys are made of a specific materail so it acts as a transmissive medium, which is like poor mans fibre optic. The earlier prototypes were CNC'd keys, with injection molding the current design doesn't have the refraction issue you're referring to. I'm an mech engineer working at Sonder, we have an optics eng who worked on this side.