Mr Fuji said he encouraged his children to exchange their unwanted toys with other children in Japan.
Eventually, he collected thousands and his creative flair led to the recycled toy dinosaur exhibition, the dystopian-like sculptures have been dubbed 'Toysaurus'.
“My daughter had a lot of this kind of dirty plastic toys, we decide in my family ‘OK try not to throw it away’,” he said.
“And the good toys going to the children, and the very dirty toys or broken toys I collect in my house, that was the start.”
He turned the unwanted toys into sprawling landscapes of colour and a place for children to play and learn.
About 50,000 toys have been used in the exhibition.
Jurassic Plastic Curator Kathryn Hunyor said the dinosaur playground painted a picture of excess and mass consumption.
“As you wander around and look more and more you start to feel a little uneasy and you think about the excess and the mass consumption and childhood now is just filled with plastic,” she said.
The exhibition is interactive, giving guests of all ages the chance to make their own recycled masterpieces from discarded plastic toys.
Jurassic Plastic runs from January 6-28 at Sydney's Town Hall.
- Additional reporting Natasha Christian