The Lab by Valve - Hidden Valve Demo Rooms

Here are a few things that were hidden in plain sight! Most people (including me) didn't find it until a second or third run through.
Note the strange Aperture Science panel behind two of the walls in the rooms. No one has figured out if they do anything special.
EDIT: Valve employee Jeep Barnett stated the monitors used to keep score of how many balloons were popped. But the decided that feature was useless and thus the monitors are just leftovers from the ideas.
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