A shoe tree starts with one dreamer, tossing his or her footwear-of-old high into the sky, to catch on an out-of-reach branch. It usually end there, unseen and neglected by others. But on rare occasions, that first pair of shoes triggers a shoe tossing cascade. Soon, teens are gathering up their old Adidas and Sauconys, families are driving out after church with Dad's Reeboks and grandma's Keds. Many inscribe messages on the sneakers in permanent marker -- greetings, love poems and life accomplishments.