The 'subunits' feature links subordinate units into a tree rooted at the 'top' unit.

She is hesitant, but accepts him when he mentions that their bed was made from an olive tree still rooted to the ground.

A path led away from the door, snaking through tall trees rooted in actual soil.

The marsh stretched far away, with clumps of stunted trees growing here and there-perhaps trees rooted on islands.

He stood like a massive tree rooted to the floor.

Many of the garden pools had mists rising from them, and in some I saw Masters moving slowly about or standing, like trees themselves, rooted in the water.

Gunnar stood apart from the tower, like an ancient tree rooted in time.

They are the maps of a man who saw the world as an extension to the human condition, not as a tree rooted on the edge of an abyss.

Out into the moonlight where the ground boiled and there stood Mother like a tree rooted motionless in the middle of a storm.

Pi Patel: "With the tall, full-sized trees firmly rooted to the ground I was telling you about."