Mapping The City in Hull (starting at Hull Truck)

I'm walking down a street, holding a book. The book's about the paradoxes of logic, and the street is one I've walked along several times, but it's never looked like this before. It's never sparked these particular thoughts before.

That's the beauty of SlungLow's Mapping The City project for the city of Hull. It takes spaces within the city and transforms them, largely in the minds of the spectators, into wholly different spaces. Twenty minutes later, those same people are in the same space, and it means something new again. Mapping The City presents its audience with three connected stories, dotted around Hull, and the first lays the groundwork well by introducing the idea of memories ambushing a man in the street. Think of all those times that something seen in the street has triggered an old memory, one with no relevance to the rest of your day. SlungLow's Mapping The City is full of moments like these, moments when the place you're in, the 'here', influences thought and when thought influences and changes your 'here'.

A small audience troops around Hull's streets, marked out by the earphones clamped on their heads and relaying the speech of the actors they follow. Occasionally, down side streets they catch glimpses of someone carrying an oil lantern, or of a suited man watching, waiting, biding his time. In the company of a guiding figure, the intrepid audience is mapping the city of Hull in their own minds. We criss-cross over the same few streets, in Hull's old fruit market area, each time investing what we see with our special meaning. As one guide tells us, the tools we apply to people-watching ('trainspotting for the soul') are from our own experiences.

Those people with the lanterns should serve as a reminder that our journey around Hull's streets, mapping that city, are part of something much larger, something difficult to understand from our own limited perspective. The second of the three scripts that make up Mapping The City stresses this point when its professorial guide tells his audience about the human habit of thinking of ourselves as being at the centre of a universe that is infinitely complex – it's helpful in small things, like walking, but much less helpful for understanding how the universe actually works.

The same is true of SlungLow's sprawling production. Though it rarely strays from roughly the same geographical area (Hull's old fruit market and marina) it's a huge logistical challenge, and one that's impossible to fully grasp from an audience perspective. SlungLow make it all look so fiendishly easy. Little moments happen that seem almost accidental – a girl passes a bus at just the right moment – but have been planned well in advance, the whole coincidence stage-managed. There is much more going on than meets the eye. Smoothly, ushers display signs advising us to remove our headphones and 'enter the vehicle', which turns out to be a line of taxis, parked silently waiting and perfectly subtle in their transportation of the audience to the soup caravan. (Yes, there's a soup caravan – isn't that brilliant?)

Whether travelling on foot, by bus or in a fleet of taxis, the audience's attention is almost entirely centred on the performers whose words come direct to their ears. Sometimes that's to the detriment of things like balance and walking on cobblestones becomes especially tricky, because you aren't really looking where you're going. Instead, audiences almost blindly follow the voices, sometimes down the same street as the last performer, but a street this time endowed with an entirely different set of meanings.

Bemused local Hullians watch, taking photos and videos, as a united group walks past, headphones on, focus intently on the couple arguing ahead of them. The audience becomes as worthy of spectator interest as the actors, and sometimes we get more attention. Mapping The City really is theatre for the city, and Hull doesn't know how lucky it is to have this going on.

SlungLow have also been disarmingly open about the process of setting up Mapping The City, and their conversion of some of Hull's warehouse space. See their blog, photos and tweets on @SlungLow.