The anthropologist and philosopher Gregory Bateson used to tell this story:
The central beam in the great dining hall of New College, Oxford, was beginning to fail. These massive oak beams—two feet square and forty-five feet long—had supported the roof since the college's founding. When the administration sought quotes for replacement, they discovered a crisis: such enormous old-growth logs were simply unavailable in modern times.
Faced with this dilemma, the staff began planning major architectural renovations. Until the College Forester, who had not visited the college itself for years, heard about the problem.
He led the astonished administrators to a grove at the edge of the college lands. There stood magnificent oaks, over 150 feet tall, planted specifically for this purpose.
This instruction had been passed down from Forester to Forester for over five hundred years, since the day the college was founded—a perfect cycle of foresight spanning twenty generations.