I believe that the symbolism here concerns 3 stages of human evolution before and after deluvian episodes. It clearly concerns water. The top symbol is the letter "mem". It's luterose cutwork feels like a synthesis of the two below.
The 2 feminine figures holding globes of downward pointing triangles are taken from an alchemical woodcut. Translucent water paper backs the 3 luteroses. The image here has been illuminated from the rear by ambient sunlight.
Acid-etched copper, fretwork, ink oxides. Water paper backing. Framed in mahogany.