"I cut strips of glass about 10 millimetres wide and then using a hand-cutter I snipped it into little bits; about 30,000 in all.
"Making the sea was easy because I could use uniform square pieces of glass. But cutting out the outlines of the countries was harder.
"Italy was the hardest country to cut out because it was so narrow."
Some of the smaller islands were too difficult to replicate.
"I call it a future map of the world because I left out the Falkland Islands; they were too small. I say this is to take climate change into account."
Mr Oste, a father of seven, grandfather and great-grandfather, joined the Men's Shed after his wife, Janny, died five years ago.
"I was very lonely and at a loose end so I decided to come to the Men's Shed," he said. "It makes my life bearable because of the companionship of the people. It's a fantastic atmosphere." He mentors a member who has disabilities and teaches him leadlighting.
Menai Men's Shed co-ordinator Gerry Flannery said it played an important role in the community.
"Most of our members are on their own," he said. "We have many widowers. One member told me that if he hadn't found the Men's Shed, he would be dead."
Members are involved in community projects such as the toy repair workshop last Boxing Day.
They have opened a mini-Men's Shed at Thomas Mitchell Retirement Village for residents who cannot travel.
The Men's Shed has about 60 active members and is open six days a week from about 9am to 3pm.
"People can come along any time; just turn up," Mr Flannery said.
Menai Men's Shed, 48 Coachwood Crescent, Alfords Point; 1300 550 009.
What's the most ambitious creative project you've undertaken?
