looking-glass

noun2

1. •
   A way into a bizarre world.

   • It has been quite a week in politics. […] I know that some Republicans feel as if they've fallen through the looking glass. — 2016
2. •
   (old-fashioned) Synonym of mirror (“smooth surface that reflects light so as to give an image of what is in front of it”).

   • The world is a looking-glass, and gives back to every man the reflection of his own face. — 1847