[Karunamon]

IIRC it may be one of the water reflection puzzles. You see the solution reflected in one half of the room, and have to repeat it on a panel in the other half. One of a small handful of puzzles I cheated - my short term memory is horrid.

[StevenRayOrr]

You should have seen my camera roll on my phone while playing through some areas. It was an incredibly helpful tool for getting through the game.