Ahh, the unfathomable cost of Modern Art these days.
Compared to the price of a genuine Jasper Johns, Herzog & de Meuron's £10 million fee for the practice's underwhelming Tate Modern extension is a snip.
After all, it's only 6 per cent of the total project cost (£163 million). The Swiss duo would have to design another four extensions if they wanted to get their hands on Damien Hirst's £50 million diamondencrusted skull. Actually, Astragal would rather have a whip-round.