Crowds of 25,000 are expected in Hull on Saturday to see an event which has enraptured people around the world.
The first major event since the year-long City of Culture arts programme, “Dominoes” will see 12,000 breezeblocks weave their way through streets, public squares, a shopping centre and a council estate.
On the stroke of 4.30pm on Saturday, the first will be knocked over, creating a chain reaction just over two miles long and lasting around 60 minutes.
Along the way the domino run will go into the Guildhall’s council chamber, before escaping via a window, falling from the balcony at City Hall and stopping traffic on Ferensway.
Hundreds of volunteers will help build a number of ingenious setpieces, also from breezeblocks, from 12pm.
People can explore the full route from 2pm and pick a spot to watch the dominoes fall.
Starting in the Boat Yard at Hull Marina, the first section will pause in front of Burt's, the new pizzeria at C4DI, before hopping on a truck to restart at Australia Houses on the Great Thornton Estate. There will be a spectacular finish at Queen's Gardens where the Yum! food festival is taking place over the weekend.
The spectacle has already been performed to acclaim in cities including London and Melbourne.
Artist Julian Maynard Smith said the blocks did all “the things you are never allowed to do in real life... a bit like an errant child playing”.
There will be a mixture of big structures - the Queen Victoria statue in Queen Victoria Square will be getting "skirts" made from ascending staircases of breezeblocks and a "big spirally thing" will be built in Queens Gardens. Mr Smith said: "There are lots of little things they do, which is funny, like jump over tables and interfere with normal routines.
"Having fun with the city - that's what appeals to people - it's quite childlike.
"We've had enormous crowds coming to see it - 40,000 to 60,000. The streets are really rammed some times."
He added: “Trying to make it all happen at 4.30pm on a Saturday afternoon is a bit like organising an army.
“God knows how many tonnes of concrete have to be in place at a specific time.
“Accidents do happen, a bit could start falling beforehand, but we do have little breaks all along so if we do lose a bit, it’s not a disaster.
"Everybody is very protective of it - people want to see it. They don't want to ruin it and kick it over."
*Yum! attractions (from 10am until 8pm on Friday and Saturday and from 10am until 4pm on Sunday) include free children’s entertainment with face-painting, healthy cookery classes and cupcake decorating.
It will present the region's best locally sourced food, including some of the stars of the Hull Street Food Nights, dishing up everything from tapas to Tex Mex.