Helena shook her head. "I'm not sure. I know that they become as sturdy as solid wood when they become part of the trunk." She gestured toward the thick base of the climber just behind them. "I've seen the vines rooting and sagging into the trunk, growing in to it, on other climbers around the field." She turned back to look at him and shrugged. "All we can do is experiment. I was really hoping to use the vines just to make the tree much safer than it currently is. Railing and nets. Things like that."