"Do you understand the plan?" They all stared for a few silent moments. Then Simon pointed. "What's that wobbly thing?" he said. "Is it a tree?" "Those are the ," Jace said. "Ohh," said Isabelle, pleased. "So what are the swirly bits? Is there a moat? "Those are trajectory lines - Honestly, am I the only person who's ever seen a strategy map?", Jace demanded, throwing his stele down and raking his hand through his blond hair. "Do you understand I just said." "No," Clary said. "Your strategy is probably awesome, but your drawing skills are terrible; all the Endarkened look like trees, and the fortress looks like a frog."