Well actually a "Southern Old Lady Moth" Daspodia selenophora that took shelter under on a rafter under the deck. The camouflage is so good I am sure I would not have seen it if it hadn't fluttered onto that spot having been disturbed from the ground below. A reasonably large moth, with a wingspan to 90mm with large eye spots and generally a night flier.
One of the NOCTUIDAE family and found throughout southern Australia, NZ and south to Macquarie Island in Antarctic waters. the caterpillars feed mainly on Acacia species