In the park of the Summer Palace in Beijing I witnessed and old man writing beautiful calligraphy with a sponge-like brush on the floor. He seemed not to be the slightest bit irritated by the noisy people around him, and when we asked him later, he told us that he was just spending some time while waiting for a friend.
The old man beautifully wrote an ancient poem, a citation of Mao and the words “Spreading Buddha’s Light in all World”.
I once read that calligraphers will experience enlightenment after many many years of practise, even when they never practise any Zen. This old man seemed to have integrated in his writing all his and his ancestors past experiences.