I was at a meeting in a historic house in Baltimore this week and it was a place where I had worked many years ago. I knew a secret about this house, and I went looking for it… behind a door that said “under construction”.
Over the years, people have tried to duplicate the technique, but it’s failed rather miserably as you can see in the left of the image. The paint’s been scratched off and the technique isn’t nearly as refined as the original.
And I knew the secret.