Changes to my desktop - What is going on

This morning when I logged into my re-booted machine after an update I have been welcomed by a changed Desktop:-

Why have these icons appeared? Any ideas?

I have been trying to re-build my Home directory tree. Is this the reason, it is just that I do not recognise these.

I have worked it out. It is because I have moved my Desktop directory to the planned new tree position.
Sorry I wasted time here.