Well, finally bisque fired. I have applied a coat of brown shoe polish in an experiment which brought results I like very much. The final thing to be done is the mounting of a wood block that is smaller than the outside dimensions of the piece so that it will "float" on the wall.
I made three of these initially, each one entirely unique. The photos are of one of the three. I will probably make more to do further experiments with surface finish and presentation.
I would appreciate very much your thoughts. Have a great day!