This is Somerset House, the building which was the home of the Royal Academy from 1780 to 1836. The Academy represented the art establishment in Gillray's day, wielding tremendous power. Gillray's print makes clear how many of its members - lined up beneath Miss Provis's rainbow - were sufficiently stupid and gullible to be taken in by such a confidence trickster. Ominous cracks are appearing on the walls of Somerset House.

The building still stands on the Strand today; it is now the home of the Courtauld Gallery.