I'm sure once you've seen it, you'll look forward to the spring a little more. I hope you'll notice more things .... and it can happen anywhere in England, you don't have to go to Woldgate. Most people think this is a perfectly ordinary little lane, nothing much, really. So you can see it anywhere in England - and I think it will maybe make you observe it a little more and I think that would be thrilling, actually. You'd get a thrill. Isn't that a good thing? I would think so.

(David Hockney)

This has to be one of the most joyful, vibrant, life-affirming exhibitions that I have ever seen and I shouldn't think there was a single person at the Royal Academy today who'd agree with this niggardly reviewer in the Telegraph who gave it a begrudging 3*. I got a thrill. I came away wishing that I could go on a fantasy road trip with Hockney, Constable and Turner, and maybe we should ask Matisse and Cézanne to come along ... and, of course, we'd give everybody an iPad. Imagine what Matisse would have done with an iPad.

What technology needs is imaginative, mad people to start using it ... and that's going to happen.

The iPad drawing above was made on January 2 last year, one of a breathtaking 52-part work called The Arrival of Spring.