Learning while doing

Yesterday I sat in the studio, next to the childrens room, and I happened to overhear their conversation while playing. They played and made up characters ad hoc while building up a story together, making lego constructions to match it. All at the same time. A learning while doing thing that I guess many adults, including myself, have forgot how to practice, but should be happier if we did. This would probably lead to increased learning, creativity and playfulness, as well.