Sempi gets very creative when he's building Lego structures. So I asked him about it.
Me: How did you get so good at building these lego creations, Sempi?
Sempi: I don't know, I just like building things.
Me: Would you say that I should just keep building things and I'll get better over time?
Sempi: It is easy to create something for yourself. You know what you want and you can make a place for a boat or an airplane in your creations. It comes easily when you know what you want.
This sounded vaguely familiar and then I realized this is a paraphrasing of one of Paul Graham's advice about startups.
Build something you yourself want.