When Grandpa was a boy, he befriended a creature on the family farm who could be invisible to human eye. This creature sat on the shoulder of Jack (Grandpa) and, being invisible, guided Jack with answers to exams and other problems.
The friendship lasted all of Jack’s life and even helped him, as an adult, with business problems and decisions, so that his grandchildren also had access to this knowledge and guidance.
This story is based on family farms in East Anglia, which have records for the last 1000 years and the ebb and flow of different cultures. The basic wildlife has remained little changed this last 1000 years other than wolves dying out, but the forests that covered all of the areas have gone and so the creatures supported by them have been reduced. In this story, the Guardian maintains the balance and still uses his five-year calendar gold hat (German museums have some of these dating from the Bronze Age). It was the spread of arable farming that needed these tall hats and grassland farming calendar hats were less high. Much old knowledge on astronomy and seasonal cycles was lost when the hat use and class of people who interpreted their information were done away with by incoming Christians who melted down the gold hats to fund the first churches.