happy man holding bright bulb and thumbs up gesture or sign. unhappy man holding dull bulb and thumbs down gesture or sign.

and bearded body brain brainstorm bright bulb business businessman cartoon casual character clever concept creative creativity down dull electric electricity emotion energy environment expression face feeling gesture hand happy hold holding idea illustration imagination innovation inspiration intelligence intelligent invention lamp language light lightbulb male man men people person power problem professional reaction sign smart solution style success symbol technology think thumbs unhappy