So that was supposed to be the visual representation of one hand clapping?

Then there's this;

WordNet
zen - noun
1. school of Mahayana Buddhism asserting that enlightenment can come through meditation and intuition rather than faith; China and Japan
2. a Buddhist doctrine that enlightenment can be attained through direct intuitive insight
3. street name for lysergic acid diethylamide

WordNet® 2.1, © 2005 Princeton University

So in answer to CHOPPERs question, I'm wondering if #3 might have been involved in the design process.