Could Philly’s skyline have timber in its future?

When you were a child, did you always want a treehouse to play in? Now that you’re a grown-up, you might actually be able to live in one.

Architects and engineers have been constructing tall buildings out of steel and concrete ever since the skeleton frame was invented in the 1880s. But a recent technological advance now makes it possible to build them out of an unlikely material: wood. Is Philly’s newly shimmering skyline ready for something a little more natural?