One more sleep until The Giants wake Perth

Thud. Coffee ripples in cups along the Terrace.

Thud! Water shoots from a broken pipe, cracking the pavement.

THUD! She's coming.

It will start at 9am on Friday. Standing six metres tall, Little Giant Girl will wake at the Perth foreshore to kick off larger-than-life spectacular The Giants.

Over three days, people will look skywards along city streets as massive marionettes re-create the story of the little girl on Breaksea Island who farewelled Gallipoli-bound troops.

Perth International Arts Festival director Jon Holloway said the story of the Anzacs was what convinced the world's largest puppet show to come to WA.

"Obviously, the giants are moving themselves because they're real, but the machinery around them needs help," Mr Holloway said.

"There's a team of about 70 people physically moving that machinery at any one time.

"There's also a team of about 300 volunteers who work on the show."

Premier Colin Barnett said having the giants teach the children of today an Anzac story was the most compelling reason to invest $2 million in the show.

"I urge parents bring your children along - this is a once-in-a-lifetime experience. Come see the giants in Perth," Mr Barnett said.

Some CBD roads will be closed during the event.

Changes will also be made to public transport routes and services.