Are you impressed with fine, inventive furniture workmanship?  You will be amazed as I was as you watch, yes, I said WATCH this video of David Roentgen (German, 1743–1807) Berlin Secretary Cabinet. 

It was built 1778–79.  It is  11 ft. 9 3/8 in. high and can be seen in Kunstgewerbemuseum, Staatliche Museen zu Berlin.   Photograph: Stefan Klonk, Berlin

Click anywhere on the picture
and you will see this the video.