Feedbadge

A feedbadge is a passive foamstone artefact similar to feedbling except it is worn by an object, not a person. It gives data to any scroll pointed at it. For instance, all the Witnesses in the Place of Remembrance] have a feedbadge on their foreheads that tells the scrolls of users who they were. The shape and style of the feedbadge will also offer clues.