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[Tidus]

That's an interesting observation, Spiff.

Now that Portal 2 mod tools are available (basically it lets you create maps and stuff for mods) I have managed to see the models from the teaser, which were impossible to see before.

So by now I have found that in the US map with the marked travel there's another texture of it in the reversed side; but it is different. Check:


Let me explain that, from a developer perspective, this is done in purpose. The map is a model made by polygons. Optimisation for games is really important, so, the less polygons, the better.

The map has two sides, instead of one. That's why each face has a different texture. So the second texture had to be important.

I'm still looking the models, I'll post whatever strange I see.