Beautiful people are always with us, as evolutionary psychologists and a trip to the news-stand confirm.

The singular point of beautiful objects, and people, is that they are experienced not as parts, or ratios between cheekbones and chin, but as wholes. The experience of beauty is a perception, but it is one that mixes up various other sensations and makes them converge in a particular way.

What is the most interesting thing to people? Other people.

I'd been to Stourhead and was inspired by the perfect parity between architecture and art; in fact, the architecture is the art. I wrote a piece called 'Not Sculpture Park,' because most of these things become car parks for bought-in sculpture. The artists should be working with the site, not just plonking pieces down.

Pick up a sunflower and count the florets running into its centre, or count the spiral scales of a pine cone or a pineapple, running from its bottom up its sides to the top, and you will find an extraordinary truth: recurring numbers, ratios and proportions.

But I do believe architecture, and all art, should be content-driven. It should have something to say beyond the sensational.

You know, Darwin said through natural selection things go gradually, and he was talking about pigeon's evolution or horses evolving, getting faster. But in fact if you look at evolution on a bigger scale, cosmic evolution and you look at culture evolution you see it jumps, it goes through phase changes, and that's very exciting.