When I was a kid I did not doodle just to doodle. I always needed a project. I later tried to study fine art but my lecturers politely suggested I might be more suited for illustration. Art as a project. Art with a purpose. Which probably explains my later career as a graphic designer. Give me a blank page to doodle and I will just freeze. But give me a problem to solve, a project, and I will dive right in.