I had never seen this bit of transformer furniture before; It appears that I don't hang around on European beaches very much, because they are aqpparently very common there. It is a Strandkorb, or beach basket, invented in 1882 by Wilhelm Bartelmann in Rostock, Germany. Accroding to OASIQ, the manufacturer of this updated version, it was designe dfor a young woman with rheumatism who still loved the beach.The Strandkorb allowed her "to enjoy the benefits of the sea air while protecting her from the elements of sun, sand, wind and rain."
It all packs up into a trunk and rolls away.
As I mentioned, they are popular on European beaches. More on Wikipedia.