[It's the impatience and the dismissiveness that makes Anton wary. Though he knows who Stark is, this one is still a child, and subject to a child's eccentricities; and the preciseness of mimicry is the reason Bakura's sigils failed the first time he tried.]

Fluidity and connection is more important than technical accuracy. As long as the sigil contains all the necessary characteristics, they can face any direction and can come in a variety of shapes.

[It seems like an idle addition, the sort to expand knowledge of context, but it's still something of a direction.]