Since Cassina became a sponsor of my program Collecting Design this year, I have been constantly asked whether any of the furniture pieces produced by the Italian company is considered collectible. The answer is yes, and I would like to bring as an example the sideboard, which Gerrit Rietveld designed in 1919, the same year in which Walter Gropius founded the Bauhaus school in Weimar. While the Dutch furniture designer and architect created the prototype of this remarkable piece, it has been destroyed many years ago. In 1970, Cassina began producing the sideboard, but as production was found extremely complex, the company ceased the production after making the first ten. One of them, today in the collection of Michael Boyd, featured in AD, was sold in 2008 at Dorotheum for $74K.