Related Clues:
- Prelude to a solution
- Brainy inspiration
- It may come to a head
- ''What's the big ___?''
- Genesis of an invention
- Inventor's flash
- Think tank products
- ''It seemed like a good ___ at the time!''
- Creative sparks
- It's in your mind
- It may be bright or big
- "An __ is salvation by imagination": Frank Lloyd Wright
- Creative output
- Step one of an invention
- Mental inspiration