Van Doorn created these fanciful, imaginative toys that subvert gender norms to illustrate a point about them. Since the 70s, there has been an increasing distinction between "sex" and "gender." Your sex is determined by your genitals, your gender by expectations about the behavior that you should show. The differences between men and women are primarily social, in our modern society we don’t need those defined gender roles anymore. It has been suggested that we set up our society in a way to reduce biological differences in order to develop skills that fit to our own capacities based on our talents instead of societal stereotypes. Thus, van Doorn came up with her set of toys, which could help the next generation develop their own skills from an early age, regardless of biology.