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“There is a scientific aesthetic to the existence and discovery of multiple worlds in this series – researchers are investigating the phenomenon, and we meet scientists and philosophers and would-be exploiters. All those folks can only learn about the worlds laboriously and slowly. But Will, one of the two leads, has a pure fantasy-object, and it’s perfect – an iconically desirable magical item. His ‘subtle knife’ can slice through the air into another world, creating a temporary portal. When he uses it, you can almost feel it slipping through the secret stuff that keeps us separated from those just-out-there realities…” Read more...