The Old Pang was a famous zen teacher who lived a long long time ago.
All his life he took care of his garden. Every day at dawn he would go in the garden and take away the wild herbs. He followed this routine for many decades, day after day, to shape his garden into the most beautiful piece of art.
One day, as he was working, he was suddenly stroke by a realization: everything disappeared and he was immersed into emptiness. There was no garden, no wild herbs and no gardener. There had never been anything but a dream in Pang’s mind.