Although I realize now that it's not perfect. In Portal, doing this would basically mean an endless copy of the space between the two portals in a straight line. In reality, light bounces in between the two mirrors, giving you a different linear path than running through portals in a straight line. The mirror makes alternating copies of orange, blue, orange, blue... With a portal, you'd look into the orange and see only orange lined up. Still, very cool idea that I now want to do.
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