As I recall the 3DS used a lenticular lens: you see different images based on the angle to the display. Wikipedia has some more information: https://en.wikipedi

As I recall the 3DS used a lenticular lens: you see different images based on the angle to the display. Wikipedia has some more information: https://en.wikipedia.org/wiki/Lenticular_lens https://en.wikipedia.org/wiki/Lenticular_lens