We have an existing thread about the interior design choices at Marlinspike (see
The Decor at Marlinspike), including the Sisley painting, the Rococo sideboard, and the spiffy modernist Tulip TV, but the use of design icons in the books extends even further than the Captain's family estate.
A prime example is the scene in the hotel at the start of
Tintin in Tibet, where the patrons in the resident's lounge are shown sitting on some rather smart chairs.
A little bit of investigation has made it possible to identify them as a version of the Métropole Visiteur chair, by Jean Prouvé, a noted Twentieth Century French engineer, metal-worker, architect and furniture designer.
Dating from around 1948, there appear to have been a variety of designs and refinements of the chair over the years, and I've not yet found a specific model for Hergé's reference.
As far as I can see the arm of the chair is usually plain wood, chamfered at an angle to the metal frame, to form a sort of ledge for the sitter's fore-arm or hand, and stopping short of the bend into the leg at the front; as shown, the ones in the hotel have longer, more rounded arms, possibly covered in the fabric of the chair-covering, and reaching the bend of the leg.
The stage version put on at the Barbican in London had very nice reproductions of the seats, looking very like the ones in the book, so they may have built them for the show, or there may be someone reproducing them commercially; I doubt that they were the real deal, as I've seen a reference which says a pair of originals sold at auction for $90,000!
Any other examples of designer furniture in the books that you've spotted?