From F. Bowron
Middlesbrough
The item on “Christmas Filter Specs”
(Feedback, 5 January)
reminded me of Zaphod Beeblebrox’s sunglasses in The Hitch Hiker’s Guide to
the Galaxy. The Ju Jenta 200 Super Chromatic Peril-Sensitive sunglasses were
designed “to help you develop a relaxed attitude to danger”. At the first hint of trouble
they turn totally black “and thus prevent you from seeing anything that might
alarm you”. Is this a patent infringement?
