I read in a speech Steve Jobs made once that he reckoned taking a calligraphy course was one of the best things he ever did to secure his future. He didn't intend to do anything with it, just took it as an extra class at university and kind of enjoyed it.
But, when it came to developing the new computer technologies, he realized the importance of a good font to make it more user accessible. Before that, people were just tossing on whatever worked best for the computer, rather than for the user.
He realized that functionality and style are the most important things when it comes to selling technology, an attitude that has continued to take him far.