The painted medallions on these doors sit in the middle of the glazed openings, which raises a question with only one safe answer: what are they fixed to?
The tempting answer is the glass. It is right there, it is flat, and modern adhesives will hold an ornament to it. It is also the wrong answer. Glass and timber respond differently to temperature and humidity, and anything bonded rigidly across that boundary eventually concentrates stress at its edge. A pane can carry a crack from exactly such a fixing years after it was made, for no visible reason.
So our master Indian artisans never fix anything to glass. A slender timber bar is let into the door frame behind the opening, running across it where the medallion is to sit, and the medallion is mounted to that bar. The bar is kept narrow enough to disappear behind the ornament from the front.
The result looks as though the medallion is floating on the glass. It is actually carried entirely by the door frame, the pane is untouched, and if the glass ever needs replacing the medallion stays exactly where it is.