Entitled Balance, the 70 plus kilogram piece of work has been carved using sandblasting techniques out of Pyrmont yellow block sandstone, the same material used to construct many of Sydney's historic buildings such as the State Library of NSW, the Australian Museum, the GPO building, the QVB building.

Sitting atop a half-tonne piece of sandstone provided by Norman's Quarries, the double-sided artwork takes pride of place as you enter the East Nowra Community Permaculture Garden which started in the school grounds in 2013.

"The work represents the ripples through a pond," Mr Purdy said.

"It was designed to have a soothing effect, which I imagine the garden has as well.

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"It fits in perfectly here within the garden."

Already the sculpture has gained plenty of positive comments from students, staff and parents.

"I've known NEPS' teacher and garden co-ordinator John Stovin-Bradford for a number of years," Mr Purdy said.

"He is just so passionate about this project. We surf together and he is always talking about it.

"This is just not part of John's job. It is his passion. He loves it and loves to be able to introduce children to the garden and gardening and in particular permaculture through this informal outdoor education.

"This [the garden] is completely outside my area of expertise. But when I heard about the school I really liked the fact it is around 50/50 when it comes to the mix of first Australians and imported children.

"There are lots of problems we are facing as a region, especially sustainability issues, but we should integrate 40,000-year practices with the European ways of the past couple of hundred years.

"John asked if I would have some work I could donate to the garden and I wanted to be part of his vision and dream."

Having his work on show is nothing new for Michael, he has had works displayed in Sculpture by the Sea at Bondi on 10 occasions and has won numerous awards for his work over the years.

'Balance' is part of a long series of works roughly entitled Earth Eggs Michael has produced.

"People all react differently to works," he said.

"I like simple, organic forms with detailed patterns."

However, Michael's technique is not what you would call traditional - working out of JG Baker Abrasive Blasting at the Flinders Industrial Estate at South Nowra, he uses compressed air to drive chisels to produce his carving style works.

NEPS' principal Kristie Goldthorp thanked Mr Purdy for the stunning artwork.

"It's just a beautiful piece and we can't thank Michael enough for his generous donation," she said.

"It beautifully demonstrates the synergy and balance between the wellbeing the garden offers and education."