From S. Lampitt
I was intrigued by the article on least action with its comments on footpath routes
(“Easy does it”, 9 May, p 44).
When I walk on streets and pavements where the surface is smooth underfoot, I
take a straight line to walk the shortest distance, cutting diagonally across a
bend in the road, saving time. When walking on grass I notice that I always
follow a ready-made track, even if it is not quite direct. Presumably I am
unconsciously choosing a different strategy to secure least action according to
whether the terrain is rough or smooth. Sheep do the same.
I watched my neighbour’s sheep respond to a shout announcing food. Each
animal headed the shortest distance to a track which led diagonally across the
field, turned right onto it like drivers turning onto a main road, and headed
off in single file. Not one of the sheep took a straight line to the food.
Charlecote, Warwickshire
