PORTAL 2: TESTING ELEMENT POSTERS
Aperture Science appreciates your willingness to take part in our highly rigorous testing procedures! Be assured, any and all sacrifices you will make during this testing phase will aid the progress of science. Of course failure to comply with Aperture testing protocols may result in sudden onset of sleep, nasuea or sudden cases of death.
Source of these blueprints are unknown, possibly official wallpapers?