I couldn't miss the chance to practice my drawing!
The invisible diary bug is a bug in Final Fantasy VI. Inside the Owzer's Mansion, when the invisible force prevents the player from entering the art gallery when the light are off, it reveals a diary on the nearby desk. Following the defeat of Chadarnook, the diary will remain to be viewed despite the fact that it is no longer visible on the table. The text should be disabled from popping up, but it is not.