The concerto, though, seems to operate in more than three dimensions. It's in four sections, played without a break and, throughout, Lutoslawski's control of timbre, his imagination for the most minute touches of colour - flecks between woodwind and percussion echoed high on the piano, or the terse, secretive, scurrying chaconne idea on the double basses that opens the last section - provides a unique "finish" on top of his strong architecture and the considerable flair he demands in the solo part.
Some of the magnificent piano writing resembles a giant fantasy on Scriabin or Liszt; at other times it puts one in mind of Bartok's 'Night Music', echoes of strange creatures from invisible corners. Above all, its vision has integrity, its form offers an entirely personal twist on the tradition and its voice - whooshing the concerto concept into the late 20th century, hands first - should assure it a place in the standard repertoire from now on. It's not easy listening - whoever said listening should be easy in any case? - but the better you know it, the better if gets.
As for Lutoslawski's comment that the piece is "very playable" because, as a pianist himself, he wrote it to be so...that might seem amusing to anyone peering over at the antheap of notes assigned to the soloist. But I'm reliably assured (by Zimerman) that the bits that sound difficult are not in fact the hardest to play. He is, incidentally, in marvellous form.(And no, he didn't bring his own piano this time - apparently this concerto, written to be played on a modern concert grand, doesn't need anything more.)
Where next for the contemporary piano concerto? Ligeti's is a favourite of mine - if I'd been a real pianist it would have been top of my liszt. What a pity it is that, as we hear on the grapevine, certain efforts to persuade him to write another, bigger one didn't come to fruition. James MacMillan's concerti and the two by Lowell Liebermann have both fared well, not least thanks to the ballet world - the Royal Ballet whiz-kid Liam Scarlett has now choreographed both of the latter's. But what the rapturous reception for the Lutoslawski seems to prove is that the form is far from exhausted, the notion of it anything but dead, and there's an excitement out there that's ready to celebrate exploration and adventure within a familiar genre.
The mixture of The Rest is Noise, The Minotaur, Lutoslawski's centenary and adventurous individuals advocating the new, strong and creative - notably Kasper Holten at Covent Garden - already seems to be transforming public appetite for recent music and fresh masterpieces to succeed it. I'm sure I wasn't the only one to experience an epiphany over Boulez at the Proms last summer, thanks to Barenboim. New and recent music needs great performances to win new and thriving audiences. On Wednesday night, Lutoslawski got one. Here's to many, many more.