Is the Door To Nowhere important, or is it an easter egg?
In Piero's office, there's a readable note that talks about his "Door to Nowhere" invention.
Near the stairs, there's a doorway with a symbol on it that looks suspiciously like the Portal logo.
Is this important to the game, an easter egg, or just a coincidence?
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Acheivement Hunter called it an Easter Egg, so I guess there is nothing more to this than what is shown in this video.