https://techcrunch.com/2018/02/16/apple-employees-are-reportedly-walking-into-walls-at-the-companys-fancy-new-glass-office/

People in glass offices should probably watch where they’re going. Collisions have been one very clear downside of Apple’s $427 million spaceship office in Cupertino, according to a story out of Bloomberg.

The “people familiar with the incidents” won’t say how widespread a phenomenon all of this is, but there’s a definite potential downside to glass walls in a setting where occupants are regularly staring down at their phones. In an effort to the phenomenon, some have apparently taken to sticking Post-Its on potential hazard zones — a sort of primitive form of augmented reality.