"I assure you that if you die, you need not hand it in." Should have been in the Harry Potter movie. (This scene was, but not these words. In the film, this scene was where McGonagall explained the Chamber of Secrets.
Your designs can spark a whole range of emotions in people. Color theory unlocks the secrets of how to use hues to inspire joy, sadness, and even hunger. -- or, you know, make art or not to have clashing colors.