Farming

The original plywood chorus is observed carrying out a process which is described as farming:

Punching
The Farming Process begins with the creature punching it's limb into the soil: We hear a POUNDING every two seconds like clockwork. ANOTHER IMPRINT. Within it a FAINT WHITE SHAPE is coming up from just under the soil like a budding sprout. Another POUNDING. A CHORUS' LIMB goes compact before PUNCHING into the ground like a hydraulic. It leaves a new IMPRINT and then moves over a bit to make another one.

Coral Shoots
The process of pounding the soil or tree seems to trigger the growth of a Coral Shoot: We hear a POUNDING every two seconds like clockwork. ANOTHER IMPRINT. Within it a FAINT WHITE SHAPE is coming up from just under the soil like a budding sprout. SEVERAL IMPRINTS have been made in a TREE'S BARK. Growing out of the imprints are what look like WHITE CORAL SHOOTS a few inches long. The Chorus is farming.

Converging Shoots
Sometime later, the shoots appear to converge: The garden of Coral Shoots has grown larger. Some shoots are several feet long and whether they come from the ground or the tree bark they all converge at a spot a few feet in the air and just off the tree. The two Choruses are pecking and scraping at this CONVERGENCE. with their Limbs and torsos to shave away the thick Detritus that covers it.

Output
Having tethered the creatures, the children explore the Coral Shoots, and discover what is referred to as a Frond: ...the outer edges of a SOLID WHITE OBJECT about the size of a muffler. It is wedged inside the TRANSLUCENT MATRIX of converging Coral Shoots. The kids begin to slide the object out. The object is a FROND. It resembles the HEXAGONAL CONE SHAPE hollowed out in the amber plates from the adult story.