Sony Sketch
Sony was still a major player in the mobile phone market in 2013, with the Xperia Z line of models attempting to capture a greater portion of the premium segment. The most unusual phone in the lineup was the Z Ultra, which was so large that it was difficult to fit into your pocket. However, it had an amazing feature: it could be used with any ordinary pencil. Sony developers were tasked with building a drawing app for this new phone.