Some have said that Bill makes it look too easy when you see him sitting and smiling next to an array of stones which seem to float weightlessly skyward. Those who have watched him in action -- or who have tried balancing large rocks themselves -- know that it can be a strenuous and physically demanding endeavour. John Jewett captured these images of Bill in Sausalito, California, hard at work.

This was not the time that Bill broke his finger.