As Wu Long sped down the mountain passage that led to the Fantian Kingdom his thoughts were occupied by the Dao Rune and he paid close attention to both runes he had.
"I see, so the runes are made of smaller ones"
As he concentrated, he was able to see that what made up the shape of the rune that always changed form were smaller runes that also changed form and consisted from even smaller ones. Though he was not able to peer how far this process repeated and thus did not know how many layers of existence his runes represented.
He failed to notice it earlier since he did not consider that Dao Runes could absorb each other. However, it did make sense to him now as small streams of water had no other way than to become part of a larger stream just as a small lightning charge would unite and follow the stronger lightning charge in nature.