From 2:30 to 4:30 p.m.—your schedule may vary—instead of going home (often to a device or to an adult-led activity), children spend time together playing. It’s a no-phone zone! The kids are given nearly complete autonomy. There are only two rules: They can’t deliberately hurt anyone; and they can’t leave without telling the person in charge. This adult doesn’t organize any games or solve any spats. Like a lifeguard, adults intervene only in the case of an emergency.