Related Clues:

• Hypothesis
• Brainstorming bit
• Cerebral creation
• Think tank output
• Mental picture
• Mental flash
• 'What's the ___?!'
• Possible solution
• ...
• Start of an invention
• Inventor's ''step one''
• Bright one from gray matter
• Inventor's start
• Light bulb's signification, in cartoons
• Light bulb, in comics