The 15 young dancers of NDT2, all aged between 19 and 23, come from a total of ten different countries. As soon as they step on to the stage you can see that this is a class act, but the programme forces one to ask two fundamental questions. In one case, can you enjoy the dancing without enjoying the work? In another, can you enjoy the work without ever understanding what it's about?

Sleepless is by Jiri Kylian, former director of Nederlands Dans Theater's main company, a choreographer I have admired for many years. It's set to strange whistling sounds, apparently adapted by Dirk Haubrich from Mozart's Adagio for Glass Harmonica. The set is a wall of stretched sheets (pictured) through which first arms or legs or heads, and eventually all of the three couples appear, to perform a series of slow solos and duets in which, although at times interlocked, they hardly acknowledge each other's existence. Beautiful, emotionless dancing, but impenetrable, as is Sleight of Hand which came next.

In the interval that followed, Gerald Tibbs, the company's executive artistic director, told me that originally the co-choreographers - Paul Lightfoot and Sol Leon - had been making a piece vaguely to do with gambling, but two weeks before the premiere they replaced the music with a bit of the ubiquitous Philip Glass, and chucked out most of the ideas. They were interested in performing on three levels - below (the orchestra pit), on, and above the stage. On a black set, two giant black-clad figures (dancers on stilts), dominate the action, sometimes breaking into frenetic arm-gestures, while a bare-chested dancer (perhaps the original of the gambler?) is central to the action on the stage. This work creates a wonderful, moody, mysterious feeling, with a gothic atmosphere of pain and gloom. It's great to watch, but heaven knows what it's actually about.

Finally, the company lightened up with all 15 dancers on stage for Alexander Ekman's Flockwork, which reminds me of schoolchildren being very naughty in the dining hall, and owed much to John Cleese's Ministry of Silly Walks. Great fun.