The challenge given to me by Kali was “glue glyphs.” This is the backside of a cast cement fake stone that came off the huge anachronistic fireplace that used to occupy our living room. The “stone” has been sitting outside, so I had to wash it off, but there was some glue residue there. Some processing applied.
@randystreat Thanks , Kathy. Kali gave me a link to examples. Once I saw them I knew what she was talking about — just had never heard that term before.