This slumping row-house in London’s Charterhouse Square is not a “building” per se, but rather an objet-d’art from the Stunt-and-Clutter school of contemporary art called “A Week at the Knees” by one Alex Chinneck. I confess, I don’t even get the verbal gag. Seems like a non-sequitur to me. But so is most of the production from Stunt-and-Clutter Ltd. The aim is to astound the public with startling originality. Since there are no longer that many new things under the sun, this calls for ever more extreme ventures into the absurd and hallucinatory. Between the general overload of Internet-generated info...