At first glance, the white plastic box with a bright orange floor looks like something for storing children's toys. However, the box isn't used to store Lego bricks; it contains real mice—with the aim of minimizing their suffering. "This box allows laboratory animals to be observed in a humane and standardized way, whether by us here in Zurich or by researchers on the other side of the world," says Oliver Sturman, Head of the 3R Hub.