At the peak of noon, a philosopher and a Zen master conversed as they walked through a city park. A church bell sounded in the distance.
The philosopher, a deep thinker, turned to the Zen master and asked — "Is the sound of the bell real or an illusion?"
With a smile, the Zen master answered — "Yes."
Perplexed, the philosopher insisted — "But which is it?"
The master replied — "Exactly."