Apparently the joining of the Nokia N900 with the Viewmaster, using the Nokia N900’s 5 megapixel camera you can create your own 3D images. Look into the Viewmaster to see miniature 3D images or you can throw on a pair of 3D glasses to watch a show and create your own photos.
The Nokia N900 sits inside the Viewmaster and when moves from side to side a switch is triggered then an Arduino send a message via Bluetooth to the N900, a Python script leaves a message and a GStreamer saves a frame from the camera as a JPEG and once 2 images are captured numerical transforms colour and size while pygame controls screen display.
There you go.
Source: phonesreview