picture by Hiddenson
Actually, it wasn't that bad: we made a pretty good hash of our Fibonacci spiral.
We had a 30m line and a stick and we worked out an effective MO: one of us at the action end applying a considerable centrifugal force to drag a tethered stick through the heavy, wet sand to mark out the sections of the spiral, the other at the centre playing the important role of 'dead weight' : anchoring the line and encouraging the hapless scribe: "keep it taut! keep it taut!"
We constructed 10 sections, the last with a radius of about 25metres, marking out, then, a pitch of about 500m2
The beach rangers didn't like it all. "We don't like it at all", they said, dismounting from their landrover. "What is this about and can we please see your CRB certificates"
"It's a Fibonacci Spiral", I said, "constrructed from a famous sequence of numbers discovered by Leonardo of Pisa, son of Bonacci, and often, it turns out, found in nature, defined as F(n) = F(n-1) + F(n-2), Pete! Keep it Taut!"
"And with the ratio of successive terms tends toward the Golden Section!", exclaimed the young beach warden, relaxing, "That's OK - we were worried that you were doing something irregular".