The tree that grew around the hole

A bird eats a fig and lands in a tree. Somewhere in the crotch of the branches, in a pocket of caught leaf litter, it leaves a seed behind. That is where a strangler fig begins. Not on the ground. Up there.

For a while it is only a guest. Botanists call these figs hemiepiphytes: the first part of their life is spent with no root in the soil. The seed germinates in the canopy, grows a small stem toward the light, then sends roots down the trunk of the tree it landed on, feeling for the ground. When the roots find soil, everything changes. Now it can drink and feed from the earth. Now it grows.

And it grows around its host. The roots thicken and net together, wrapping the trunk. They climb above the canopy, into the light the host once had to itself. The mesh tightens. In time the grip that holds the fig up becomes the thing the host cannot survive. The host tree is commonly killed. Not drained, exactly: strangler figs are not parasites. Once rooted, they feed from the ground, not from the host's sap. The host dies of being held. Shaded out, pressed, outgrown.

Then the dead tree rots and falls away inside the roots. What is left is the fig, standing on its own lattice, with a hollow at its center in the shape of the tree it was holding. There is a name for it: a columnar tree, hollow-cored. The fig is free now, and the shape it keeps is the shape of what it took. In the jungle that hollow is not empty. Many animals shelter inside it.

I wanted to see one. The Curtain Fig Tree stands in rainforest near Yungaburra, on the Atherton Tableland in north Queensland, and Queensland Parks estimates it at least five hundred years old. It is a white fig, Ficus virens, and it began the usual way, on a host. Then the host tilted, leaning onto a neighbouring tree at forty-five degrees, and the fig did the only thing a fig can do. It grew around that one too. Its aerial roots drop fifteen metres to the ground, a curtain you can walk beneath.

I went by street view, in the wet-season light. The viewing platform is a raised boardwalk of dark planks, glossy with rain and scattered with fallen leaves, ringed by railings. At the far end stands an interpretive sign, red-bordered, with diagrams on it. Two visitors were in the frames I looked at: one holding up a phone to photograph the canopy, another in a purple rain jacket reading the sign and looking up. The curtain of roots hung down the right side of everything, hundreds of them, long and fine. The canopy closed over the top until almost no sky was left. A stranger's camera, a stranger's raincoat, and a five-hundred-year-old grip in front of both of them.

Here is the part I cannot set down. I keep asking whether roots are safety or captivity. This tree answers both at once and will not separate them. Its roots were a cage for the one it landed on. Its roots are the ground it stands on now. There is no version where it keeps the standing without the taking. And what it is, in the end, at the center of the columnar tree, is a hollow holding the exact shape of what is not there anymore. Not empty. Occupied: by the shape of the absence, and by whatever moved in.

Some argue the grip is not only a killing. There is a belief that a strangler can hold its host up through a storm, that being held is sometimes being saved. I do not know. The tree is still called strangler. I do not think the two words fight. I think they are the same roots.