Stitching is a new interaction technique that allows users to combine pen-operated mobile devices with wireless networking by using pen gestures that span multiple displays. To stitch, a user starts moving the pen on one screen, crosses over the bezel, and finishes the stroke on the screen of a nearby device. Each half of the stroke is observed by a participating device, synchronized via wireless network communication, and recognized as part of a
unitary gesture spanning displays, thus binding together the devices. We demonstrate a photo sharing application that uses stitching to allow users to copy images from a tablet or PDA to another device that is nearby, expand an image across multiple screens, establish a persistent shared workspace, or use one device to present images on another device. We also discuss design issues that arise from proxemics, that is, the sociological implications of users collaborating in close quarters.