Stroll through Covent Garden market and past the stall advertising magic tricks, and you might spot a potential magic trick out on the square beyond.

The portico seems to have been eaten through, leaving the upper part floating in the air.

But on closer inspection, it's not part of the main building, but a separate and (as it turns out) temporary installation. I rather think the picture on the right caught the tail-end end of a TV interview with the artist.

It seems to be a big hit with the passers-by; and for those wondering how they did it, the unobstrusive market cart at one end might suggest a solution: