How Do You Create?

I have started thinking about how people in creative fields get their ideas from inside their heads and out into/onto their chosen medium(s).
This has led me to the following quetsions:
How do you create?
How does an idea start in your head?
How do you get that idea out of your head and into/onto your medium?
Where do your richest/strongest/most intense ideas come from?
How do your ideas germinate?
Is this line of questioning ruining your creative process?

People I would like to ask this question of:
Jimmy Pickering
Craig Hanna
Joss Whedon
Zane Jensch
Jeremy Railton
Dave Cobb
Sam Lundquist
David Wally
Tim Burton
Neil Gaiman
Gwen Ballantyne
Robbie Williams
Annie Lennox
Kevin Smith
J. Michael Strascynski
Steve Olson
Scott Zuber
Scott Sinclair
John Barone
Alex Ross
Bill T Jones
The Pilobolus guys
Chuck Lorre
Eric Parr
Dave McKean