Mr Forrest, a self-taught artist living in Wellington, says he relishes the 10 weeks he had spent during each of the past five years travelling with the art truck as "an educator and a seed planter of epiphanies".
"It's about providing a new way of looking because with contemporary art you have to think outside of the square, outside of the box, to get your head around it. And that's for everybody not just kids.
"I introduce to the kids a new way of seeing really. Every single piece of art in here has layers and layers of meanings or interpretations, and not just what the artist is saying," he said.
"It's all empowering and for an hour after school I stay open, so the kids can brings their parents and say 'look, this is what this is about'," Mr Forrest said.
"There will be lives changed seeing something like this - the children or maybe even their parents - because having an epiphany is a neural pathway being fused and it's not training them to be artists but training them to think, to see something in a new and unexpected way.
"I've taken my own kids to art galleries for years and being an artist I want to nurture people's abilities to look and read art and admire it."
There were 72 artworks aboard the truck in a wide range of mediums that comprises about half the Roadshow collection, he said. The work was rotated for each trip and this time around included a woodcut titled The Fisherman Loses His Way by Masterton artist Robin White and the Focus sculpture by Masterton carver Harry Watson.
It takes three years to complete a nationwide tour, he said, and the truck in its present incarnation had toured the South Island and was on its last circuit of the North Island.
Roadshow founder and artist Fiona Campbell had pledged to tour the art collection for a decade and the tour this year was the last for the mobile gallery, Mr Forrest said.
The collection had been valued at up to a million dollars and it was hoped the Museum of New Zealand Te Papa would take over the operation, boosted with its own collection, and "become a truly national art gallery and take the art out to the people".