It is not quite true to say that no one knows why people prefer to turn left and walk anticlockwise (Report, 10 June). Research by the French professor of physiology Raphaël Dubois in the 19th century revealed the existence of a phenomenon in the natural world that he called the “antikinetic gyratory movement”, caused by the rotation of the Earth on its axis.
During the 1900 Universal Exhibition in Paris, he observed a tendency among visitors to walk anticlockwise. In the years leading up to the first world war, he applied his theory to explain migration (of humans and animals) and war. I documented the latter in an article in the journal Peace & Change in 1986.
Dr Peter van den Dungen
Lightcliffe, West Yorkshire
