Roentgen cabinets from the 1700s
Abraham Roentgen was a German cabinetmaker who lived from 1711-1793. Along with his son David, the Roentgens were famous for their marquetry, hidden drawers, and unusual mechanical fittings in his cabinetry.
This writing table was made for a Catholic official, and can be transformed into a private altar:
https://www.youtube.com/watch?v=vC5Hqk7wl7U
Berlin secretary cabinet:
https://www.youtube.com/watch?v=MKikHxKeodA
Dressing table:
https://www.youtube.com/watch?v=53zzt2SVde4
Roentgen furniture and related documents are on display at the Metropolitan Museum of Art, including online details here: Extravagant Inventions | The Metropolitan Museum of Art