After Cupertino building official Albert Salvador visited Apple Park last year, he was concerned about employees running into the glass walls that were placed all around the campus as the cafeteria’s doors were indistinguishable from the glass walls, as we reported last month.

After bringing up the issue, a contractor walked right into one of the glass walls, the San Fransisco Chronicle reports.

There have been multiple instances of employees requiring medical attention due to running into the glass walls, and this goes beyond just the cafeteria.

For those who don’t know, Apple Park is the company’s new $5 billion campus which is built with curved glass walls going all the way around the building. Employees have previously placed Post-It notes on the walls to help inform other employees where the walls were, however those were later removed because “they detracted from the building’s design.”

But this may not be the case for much longer, at least we think. Apple Park’s architect, Foster + Partners, are now placing black rectangular stickers with rounded corners on the glass panes to help aid in visibility. These stickers were placed on December 30, before employees started moving into Apple Park. It’s unclear whether or not these are the same stickers that were removed from the previous reports, or if these are new stickers that are required to be there.

Salvador says, “In my mind, the building is safe per the codes that I enforce,” but notes that “we don’t look at running into glass,” when inspecting buildings.

Employees began moving into Apple Park on January 2, and the incidents began on day one, with two employees suffering head injuries, followed by a third on January 4.

Afterwards, Foster + Partners and Apple began placing even more stickers for better visibility. The stickers have been effective and no further accidents have been reported regarding employees running into glass walls.

Chief Design Officer Jony Ive said in an interview at the Hirshhorn Museum and Sculpture Garden in Washington last year that criticisms for Apple Park’s design “are utterly bizarre, because it wasn’t made for you! [laughs] And I know how we work. and you don’t!”

Fortunately, the three injuries from January don’t seem to be too serious as none of them resulted in needing to head to a hospital.

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