The Ice Cream Koan: Solved
A new koan:
If you have some ice cream, I will give it to you.
If you have no ice cream, I will take it away from you.
It is an ice cream koan.
I am pleased to report that, in typical Zen manner, the solution came to me when I was not looking for it. And the solution is typically Zen, being the same for both parts:
I will give you ice cream.
For the former, I am giving you the ice cream which is already yours.
For the latter, what you actually have is no-ice-cream, that is, an absence of ice cream. By giving you ice cream, I am taking away your no-ice-cream, removing your absence of ice cream.
I have solved the ice cream koan.