Well, too friggin' bad. A four-man team dubbed Team Jigsaw designed these concepts and submitted them to the LEGO CUUSOO initiative, where supporters have a chance to vote on which ideas are made into physical sets -- this is how Mojang made his Minecraft set a reality.
Unfortunately, LEGO refused to accept Portal as a valid license. Probably because the boys don't actually own the Portal license. Duh.
All we have now are these tastes of what could have been.
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