Is the answer linked to the background scenery? Or could it be an action?
I'm a bit baffled, it has two forms, and you can see it's first one very close to the end of the game and one somewhere else in the game.... Yet, you can see it's second form as many times as you would like - this leads me to think it's either something within Memoria - something to do with the background scenery, or the answer is in a very different location... maybe on the Red Rose or the Hildagarde 3 or even the Invisible.