Trace app lets you send a secret message which can be decoded only by walking
Do you remember GPS art by Michael Wallace? He biked around the city and recorded his GPS tracks in different shapes. Really cool project.
A new mobile app called The Trace developed at the University of Washington does the opposite. The app takes a digital sketch which you draw on your smartphone into a walking route. The route creates “a secret message” which you can send to a friend or loved one. The recipient has to download the app, open the message and choose how long they want to walk. The app computes a route based on your location and Google Maps street network and prepares a step-by-step directions. When a user walk along the route he will reveal the hidden shape on a map.
Additionally sender can do a couple of additional things to make the walk more attractive. He/she can include audio recordings, images or inside messages that pop up at specified locations along the route to give the recipient hints. It’s a little bit like a scavenger hunt but at the end what you get is a message in a form of a shape. The app is available for both iOS and Android.