We are happy for animals at the zoo to have large enclosures, but if we’ve bought a ticket we do want to be able to see them. We like to eat meat, but we’d rather not be confronted with pictures of battery cages. We may be vegetarian ourselves, but still have a big dog that eats meat. “We live in glass houses”, says Pim Martens,.”Through animals, you can put the sustainability debate on the map in an engaging way”.