In Funville Adventures (self-published), 9-year-old Emmy and her 5-year-old brother, Leo, go down an abandoned slide and are magically transported to Funville, where each citizen has a unique power to transform objects, just like a mathematical function. Funville Adventures introduces young children to the concepts of invertible and non-invertible functions, domains, ranges, and functionals, all without mathematical terminology in an interesting way that they can understand.