I used to think there was an unlimited number of design options once you allowed artists supported by acolytes on computers to dream up ever more novel new shapes for buildings. Now I'm not so sure. I'm beginning to wonder if there are only so many variations on blobby/spiky/swoopy/curvy. Not only are starchitects repeating their favourite shapes, but plagiarists are ripping off their various looks. Now that the unorthodox has become de rigeur, where can we go next? I sense that the Starchitect Meccano set of shapes is being plundered with abandon - that Nouvel concert hall on the outskirts of Paris looked like he'd grabbed a Libeskind fin from here and a Hadid auditorium from somewhere else ...