Blue sky thinking refers to brainstorming with no limits. With this approach to idea generation, ideas don’t need to be grounded in reality.
Rather, blue sky thinking sessions are open to all creative ideas regardless of practical constraints.
The allure of blue sky thinking is based on the premise that ideas beget more ideas. One person may come up with a blue sky idea that is completely impossible in your location or with your budget, but that idea may inspire another idea that may inspire another idea and so on.