Above: Hidden Observer by my colleague David Lidzey, by kind permission.

Professor Mark Geoghegan
Department of Physics and Astronomy
University of Sheffield
Hicks Building
Hounsfield Road
United Kingdom
S3 7RH

Telephone: +44 (0)114 222 3544
Fax: +44 (0)114 222 3555

E-mail: mark.geoghegan_AT_sheffield.ac.uk


Content © 2018 Mark Geoghegan or as indicated.
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