Such a funny story! Thank goodness the Zen master is not my neighbor. I would've cried if he did that to me.
My view is that it has something to do with our perception on how things should be. The priest perceived that if he do a good job cleaning and maintaining the place, the special guest will be amused and praise him.
The Zen master on the other hand, knows that perceiving about how certain things should be is just in the mind and our senses.
Although Albert Einstein was certainly not a Buddhist, these statements sound much like it:
"A human being is part of a whole, called by us the 'universe', a part limited in time and space.
He experiences himself, his thoughts and feelings, as something separate from the rest
- a kind of optical delusion of his consciousness.
This delusion is a kind of prison for us, restricting us to our personal desires and to affectation for a few people near us.
Our task must be to free ourselves from this prison by widening our circles of compassion
to embrace all living creatures and the whole of nature in its beauty."
"Reality is merely an illusion, albeit a very persistent one."
This view has consequences when it is applied to whatever I call "I" and "mine":
- I am not isolated from my surroundings and other living beings.
- I "create" the world with my own concepts and ideas.
- The world is like an illusion: how I see the world depends on my own ideas/projections.
- This world is "my" film, "my" projection, I run the show, so I can change my experience of the world.
- I can change the world, if I start with my own mind.