This is a root-over rock Ficus microcarpa I have been growing from
seedlings since 2015.

The tree today.

One of the seedlings I started with. The roots are attached to a
rock with raffia.

A second tree, attached to a separate rock.

Beginning root-over rock trees in the pot that will be their new home.

New growth during summer.

Branch-pruned the following spring. Beginning the cycle.

Summer growth.

Roots beginning to grip the rocks at the start of a new year.

More summer growth.

Removed from pot, good root growth.

Exploring different combinations of trees and rocks.

I attached both trees to both rocks with raffia.

Good soaking after the work.

The redesigned tree a month later.

Clip and grow.

The tree the following winter with a companion privet being developed
in a similar way (see
https://beginbonsai.net/2019/11/02/root-over-rock-privet-ligustrum-sp/
for a description of the privet)

Removed the raffia surrounding the exposed roots.

Close-up of exposed roots.

Continuing with clip and grow.

Begin a new repot, retaining some branch clippings to start new trees.

Exposed roots in new pot.

Exposed roots protected by new soil for two weeks.

Roots re-exposed and covered in raffia.

The tree a month ago before removing dried, exposed feeder roots with a toothbrush.