Aatos is a curious person who likes to experiment and try new things. He starts his day by dressing upside down to see the world from a different perspective. When he goes to a café, he orders a pineapple espresso and discovers it tastes surprisingly good. Aatos meets up with Veera, a friend who is talented in math, and learns about her latest discovery of solving indefinite integrals by singing them. They sit in the café and sing integrals aloud, and even though other customers look at them strangely, Aatos finds it amusing and educational.