LACHLAN won his "first prize ever" at Grafton Shoppingworld using the toy bricks which have engaged the minds of Australians for half a century.
Lego struggled to get a foothold in Australian toy stores, as retailers believed our outdoor lifestyle would make them unattractive.
Lachlan and his brother Liam may have been a little lost if British salesman John Peddie hadn't persisted in 1962 to convince stores to stock Lego.
Whenever Lachlan, aged four, wants to play with Liam, aged 11, Lego is the shared activity Liam offers him.
"I have a big box of Lego; there's a bridge that turns into a truck and a big city," Liam said with enthusiasm.
"I'm going to probably build a wave or a pyramid in this afternoon's competition," he said.
"You can build anything you want from scratch or in your mind." Although Liam is the most passionate about Lego, it was Lachlan who was holding a Lego toy for winning his heat.
"I liked making the zoo. I make zoos at home with the animals in my drawer," Lachlan said.