AMERICAN FORK, Utah (AP) — While schools and other entities are increasingly turning to dry-erase markers, here is one solid reason to hang onto your chalk: Instead of customizing it once with static flowers that can't be changed, Sherman explained, hearkening back to the Volkswagens of the 1960s, it now has this fun aspect that everybody gets to add to the art and it is ever-evolving, constantly changing. Drive-thru workers, churchgoers, neighborhood children and the like enthusiastically contribute to the overall design of The Chalk Bus when they're fortunate enough to cross its path. Barkle's family spent an evening drawing on the bus to teach his children, "You can express yourself positively and let the whole world see those positive messages because he'll drive it around town and people will see what you've written and think happy thoughts," he said. After a recent hospital visit, Sherman returned to positive messages in chalk. People might be lucky to catch sight of The Chalk Bus while out and about in American Fork.