The Story Behind This Mirror
A cushion mirror is really five mirrors that have to behave as one. If the margins are cut a fraction out of true, the reflections in them break the line of the central plate and the whole face looks fractured. So the frame is set out and the rebates cut with far more precision than a single-plate design demands, and the dividing mouldings are made to hold each panel dead flat - a margin that bows shows immediately in what it reflects.
The carving is done separately and applied to that structure. The cameo cartouche at the crest is shaped from the solid and carved in relief within its oval. The fleur-de-lys motifs at the corners are pierced right through, so the margin glass shows behind them and the ornament appears to float on the reflection rather than sit on wood. The rosettes on the side and base rails are cut individually. Then hand-sanding through progressive grits, gold laid in coats and rubbed back at the cornice edges and the fleur tips, and the glazing fitted last: margins first, working round, and the central plate closed in at the end.