From Dean Ware
Ben Sewell in his search for 1-sided paper in a stationery shop
(Feedback, 6 January)
didn’t even need to turn his paper into a Möbius strip as Lee Angus suggests
(27 January, p 53).
Since a piece of paper is made of atoms it
also has depth and is in fact a cuboid, which is topologically equivalent to a
solid sphere and thus only has one side anyway. So it is the 2-sided paper that
the stationer is selling that is indeed remarkable.
East Preston, Sussex
