A screenshot of the Parallax Map.
Another screenshot of the hint revealed by Parallax.
Parallax is a type of Shader Magic, obtained after clearing the Grass Temple. Parallax allows you to see things that you normally wouldn't be able to see. Cetain objects such as those seen in the image to the right and floor tiles of the same colour as the area with the hint shown on the right, will usually help indicate a solution to a puzzle such as the correct switches or the correct pitfall trap to use.
Parallax cost one magic for both male and female characters. It can only be cast if there is a hint it can find.