I think many creative people feel that they tap in to a "Higher Cosciousness" when "inspiration" comes to them. Some say that what they then produce in the way of art, music or poetry etc, feels as though it has come from outside of them.
This is very humble of them, not taking all the credit, but it is my belief that what they do comes from within them.
Our minds are incredible in their abilities, quite often we "know" something witout actually realising how we know it , I think inspiration is like that.
Many creative people also feel that it is not good to analyse the process and how it works too much, if they do they will lose their Muse.
They could be right, perhaps too much introspection is bad for us.