The statement that is true regarding the looking-glass world in "Through the Looking-Glass" by Lewis Carroll is:
Many things in the looking-glass world seem to be nonsensical but are actually logical.
In this sequel to "Alice's Adventures in Wonderland," the world that Alice encounters is characterized by its whimsical and surreal nature. While it may initially appear nonsensical, there are often underlying rules and structures to the madness that reveal a form of logic or order, albeit a very different one from what we typically understand.