Some of my dad's bonsai collection

The first one he did, it must be 20+ years old. You can see it is two plant which are 'glued' at the centre.
They should merge into one eventually ... I think

One in the process of being shortened.
The idea being that if you scar the trunk and keep the plastic bag moistened and dark it will sprout roots
You then cut the tree in half and replant it makig a much better looking bonsai

Here is one with a nice root system

A couple over more rocks

Two more that hang down (whatever they are called)

A favourite of mine, a nice little group

And another on in training