[Dance choreographer] Martha Graham, one of my greatest inspirations, said in a series... in a quote that 'there is a vitality, a life force, a quickening,' and for me, the idea of a quickening, the idea that the whole universe as we know it is essentially this composition of things at different speeds, is an interesting idea. So the Speed Force being like The Force [from Star Wars] in the sense that it's a dimensional reality that's manipulating others, almost like a gravitational wave that manipulates space-time; that is what's interesting for my Barry Allen. And for me, what becomes interesting is the human being who is suddenly coming into contact and rapidly starting to merge with the force, and what that is for a human being.