This sort of thing always reminds me of the particles of raw inspiration that Terry Pratchett describes as flying through the universe in some of his Discworld novels - and Leonard da Quirm, whose mind is so receptive to them. It seems to me that the ideas always come while trying to develop a story (as opposed to the more detailed writing of the scenes) and it makes me think that Pratchett might be on to something. I can envisage my mind, during story development, opening up and suddenly catching these particles and fizzing with them ... it's sort of exciting, even if rather distracting.
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