What's Going on With Light Weaving?

The story that wit tells caladin in the wirt, the second stormlight archive, a radiant. In both of these stories we see that same sort of method of story telling om in this instance, he uses the smoke from his fire and sort of turns it into shapes. There's some kind of illusion magic going on there that we suspect could be light weaving, but who knows? Hoyd has a lot of secrets.