The process for correcting converging parallel lines was impressive, too. For those who are unfamiliar, this phenomenon is caused by perspective. If you're taking a photo of a building, the lens and film plane will, obviously, be much closer to the bottom than the top. This causes the building to look skinnier at the top. A view camera can remedy this by changing the angle of the lens as it relates to the film plane. It can be an extremely tedious and time-consuming process, but the CAPcam was able to take care of it, requiring the user to simply move two lines to the desired position on the screen. It almost had the feel of playing an iPad game.