Duchamp said the difference between architecture and sculpture is plumbing - not much then. And Richard Cork seems to think the Royal Academy has done justice to sculpture with this year's Summer Exhibition.
Not so. It has still jammed the essence of the largest sculpture into the tiniest little Porter Room, packed tighter than the RIBA's smallest gallery.
Admittedly there are some shambles in there, such as Ian Ritchie's incomprehensible twigs, and the falsely elevated nautical engineering of Manser.
But there are some real buttons to be pressed, such as Jiricna's penthouse apartment and MacCormac's Broadcasting House.
Unfortunately, the real gems of the show, and well deserving of the Sir Hugh Casson Prize, are Francis Terry's capital drawings, which are wedged into the exit passage. Come on Alsop, Manser and Foster, put some weight into the RA as you put heavy weights upon the ground.
And architects, sell your prints, (they should be copyrighted after all). Give a little revenue to encourage the RA! Fun and joy.
Follie Gioir, Shoreditch, London