At a park around here...someone did an installation back in the 90s. The took saplings...oh, maybe 8 - 10 feet high and inverted them.
They planted the top into the ground and the now inverted root structure became a kind of "Hair" maybe. And they made a line of these up a hillside.
Was actually a very neat installation. over time, weather worn it down and some kids started stealing bits of it...
But it was up for a year or two and looked great...