Inside the home of Pauline Karpidas, the art-world ‘grand dame’ who could be the last of her kind

Behind the elegant but unassuming entryway to an apartment near London’s Hyde Park, one of Europe’s most prominent collectors has amassed a remarkable trove of Surrealist and postwar art in a home bursting with color and eclectic design.

Now in her 80s, Pauline Karpidas is selling nearly all of the art and custom furniture housed in…