The 84-year-old resident, of Glen Forrest, recently built a rustic seat for four with fellow member Phil Carter.
Mr Diaz decorated the seat with leftover tiles, which he painted with dancing couples circa the 1800s.
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Mundaring Men’s Shed spokesman Allan Pope said his workmanship was impressive.
“Antoine really is an amazing painter; we’re lucky to have him,” he said.
Mr Diaz said he went along to the Shed twice a week to enjoy some company and share a joke with his friends.