[MWC 2011] DoCoMo, the Japanese carrier, has showcased an interactive 3D display at Mobile World Congress. The display is dubbed the Touchable 3D Display and allows you to interact with the 3D objects served by the display. Users will need to interact with it via a pen that has its position tracked by two cameras within the system. The system is smart enough to send a signal to the pen, causing it to vibrate, offering a form of force feedback. The demonstration of this glasses-less 3D display offered a cartoon chameleon that tries to catch your pen with his tongue, and if he manages to, the pen will vibrate strongly. There isn’t any mention of when the carrier will offer this technology to the masses, but we hope that it’ll arrive sooner rather than later.