NOT a photograph in sight but photographic memory plays its part in Sensory Perception, the new-media exhibition that unites Impressions Gallery with SightSonic, the York International Festival of Digital Arts.

With only three optical and audio installations on show, it must qualify as the Impressions exhibition with the least exhibits ever, and yet still you would see people walk in, take one look, one listen, and leave for the next room. Perhaps they thought a more apt title would have been Nonsensory Perception.

How unfair, even if Susan Trangmar's light installation in the upstairs galleries could have been mistaken for two Sunday football goalkeeping nets with in-built floodlighting for after dark. If ever a piece needed its accompanying explanation, this was it.

Trangmar's starting point was the Greek myth of Ariadne, who sent a ball of thread twisting through pathways to enable Theseus's safe passage from the Minotaur's labyrinth. In turn, Ariadne's Dream plugs into Impressions' electrical currency and the ambient daylight from the Georgian windows, the change in currency flow and light affecting the two webs of 48 cables and 600 light bulbs that make up labyrinths of light.

Frankly, watching traffic lights change would be more exciting. Still, let's hope Ariadne's Dream isn't like Christmas tree lighting: one light out, all out.

Never mind that the first sound on entering Aquaduct 0 was reminiscent of that alternative watering hole, the Parliament Street splash palace. Ambrose Field's sound installation would sit comfortably in a Feng Shui-designed futurist home or could become the fish tank for the New Age, with its 'Tweeter Trees' sound sensors, computer-programmed found sounds and Big Brother camera that records your every move on the sofa. I wasn't sure if the black plastic piping was part of the chair or something to wave with vigour but the latter option was appealing, and soon the sound waves altered and multiplied with each move. Aural marijuana, man.

The sound of steady breathing - at once peaceful yet unnerving - greets your arrival in Hydrotherapy 81, the graduate showpiece from Owen Roberts. That breathing mirrors the exhibit of two water tanks, one filled with water and audio speakers, the other with a LCD video screen showing Robert's changing expression. There is peace yet urgency, reflecting his inspiration: his recollection of drowning and being revived, at the age of three.

Tanks for the memory.