Photos are shown on the surface of a regular tetrahedron. To switch from one side to another, you can either rotate it or turn it over, but you will never know which photo you are going to see next.
The shape of the frame is cut form a sphere. Once given a push, it begins to swing and pictures will begin to change. The faster it swings, the faster the picture changes. When the photo frame stops, the last picture stays on the screen.
Different from other digital photo frames, this one can not switch pictures automatically. It might seem inconvenient, but it is funny. It provides more interaction between the user and digital frame.