After deepening in the Alchemic Port:

We are in a room referring to the 9th QR code: "You are in a rusted iron chamber. Water is trickling from large iron pipes above you. On the wall someone has scrawled “When in your house black crows give birth to white doves, then you will be called wise".

"When in your house black crows give birth to white doves, then you will be called wise." refers to Saturn/lead.

Saturn is the 6th planet, which in it's case refers to the 6th QR-code, also refering to the same room with old gears, a skeleton and a jacket.

I think the QR codes that contain a quote represent planets, who refer to another QR code by their order...

Maybe it's something with the standings of the planets on a certain date? http://www.solarsystemscope.com/

Or is it all just coincidence... :/