Imagine driving down the street and suddenly seeing a giant silver ball rolling towards you like the boulder from “Raiders of the Lost Ark” – that’s what some motorists in London faced when a public art piece was dismantled by wind. Public art expert Laura S. Griffith, deputy director of the Philadelphia-based Association for Public Art, joined Mike Rogers on the “Something Offbeat” podcast this week to explore what goes into making public art safe and why this art is so important.