OK Uwe, the first video answered my question. The shadow is actually wood burning, not marquetry. The letters themselves are marquetry. That’s an interesting combination.
I thought that you had cut the shadow from the same light coloured veneer as the background and then darkened it with the torch.
I would have cut it from darker coloured veneer. Our methods are different but there is always something to learn.
Thanks.

The early bird gets the worm but its the second mouse that gets the cheese.