A question that can only be asked upon reflection is a question that requires looking at a mirrored surface to find the answer.

In the Batman: Arkham Knight video game, this riddle is encountered in the Riddler’s Quest challenge.To solve this riddle, you need to hit three large glowing green question marks with your Batarang to rotate the circular plate on the floor. The goal is to align the rings on the floor into the shape of a question mark, with the top of the symbol facing the locked gate.

Then, you need to find a location where the spotlight above the door appears in the mirrored floor in the position of the dot at the bottom of the question mark symbol. Scanning the completed question mark symbol will open the locked gate