Making mental links between things that are not normally or have not previously been recognized as the source of a new idea
A core skill of brainstorming and creative-problem solving is learning how to make connections; those "a-ha" moments when two or more seemingly unrelated, even irrelevant signals in the brain suddenly come together to create a powerful new insight, idea, or conclusion. Connections almost always require a lot of developmental work to make them real, but the core of the idea/solution is embedded in the connection.