There are three of them in the collection of the National Gallery of Victoria. In one, giant possums on top of spaceships fire down on a group of children running screaming along a pebbly overcast beach. In another, a kangaroo appears to cast laser beams from its eyes, hitting a man in a suit who reels back arms out, while a terrified mother and child in a pram look on in horror. And in the last and undoubtedly strangest, giant featherless yellow-crested cockatoos sit atop pedestals on either side of a tube station entrance squawking at commuters as they come up the stairs, while next to them their chicks are propped up high in a nest on a streetlamp, and what looks like a statue of a rider on a horse turns away in the background.