They seem to be a visual timeline of Mithos's memories, detailing a world that definitely isn't Aather. He's been around a while and won a lot of memories, so it might be a little alarming that more than ninety-five percent of the timeline is blank.

There is a large cluster of embroidery near the beginning (you might spot Martel's death near the end of this section). Some small blips and one biggish blip around the middle. Another large cluster near the end (Lloyd appears here; they seem to be fighting.) The end itself is blank. Are you looking at any section in detail?