At many companies, employees complain of hitting the glass ceiling as they try to advance their careers. At Apple headquarters in Cupertino, California, glass walls are the problem. Apple Park opened to employees in April, 2017 – while construction was still ongoing – but giving workers early access apparently didn’t help them acclimate themselves to their new surroundings. The interior of the architecturally lauded facility features many glass walls and doors, in keeping with the company’s sleek aesthetic. Encounters between employees and glass walls, according to news reports, are frequent – and sometimes painful.

A Twitter user reported that on the first day Apple Park opened, seven people injured themselves by walking into glass doors. At least two of the human v. glass incidents that have occurred since the building opened resulted in injuries serious enough for EMTs to be summoned. 

Adding to the risk: a tendency for Apple employees to be focused on their smartphones while they navigate around their workplace.

Some people reportedly stuck Post-It notes to the glass as a warning sign, but management removed them because they were unsightly.

To date, there have been no complaints filed with OSHA.