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Letter: Letters: Stereo stumped

Published 13 November 1993

From GERHARD LENSSEN

Help. I see the aircraft always as a hole, not elevated (‘How to play
tricks with dots’, 9 October). Some switch in my brain seems to be poled
otherwise. Can someone give me a hint on how to switch over?

Gerhard Lenssen Bernkastel-Kues, Germany

Issue no. 1899 published 13 November 1993

Â鶹´«Ã½ issue 1899 cover

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