magic checkin clock

A  magic checkin clock  is a physical analog-style clock where the hand(s) display the current location(s) of one or more persons who publish their location with checkins, typically via Foursquare's Swarm, based on the Weasley Clock.

Aaron Parecki
has had a magic checkin clock since 2016-01-04
 * http://aaronparecki.com/notes/2016/01/04/2/harry-potter-clock