Penki

(iPhone, iPod touch, and iPad. iOS 4.0 or later) Penki is an app that allows you to paint with light – creating 3D messages and images with an iPhone that are revealed in long-exposure photographs. Penki slices your message into a series of images, which are played back on the phone’s screen – over a long exposure photo, the words and messages are visible when the phone is dragged in front of the camera. Design by Dentsu London