Similar to the parallax effect, the 2.5D effect adds movement to your images. While not quite three dimensions, the layers and/or objects within an image can be made to move independently of each other with 2.5D; giving a surreal motion feel to your still images.  It can be achieved using Adobe’s After Effects and Photoshop. Here UglyMcregror efficiently walks you through the process of transforming a still image into 2.5D.