Monocular Cues 2

Another monocular cue we use is relative size.  We use relative size to perceive depth and placement of things in space.  The larger the image, the closer it is perceived to be. If an object grows it is perceived to be getting closer. Conversely, if it shrinks it appears to be getting further away.  This can be seen in the picture.  We perceive the creepy cow as being closer because it is bigger in comparison to the zebra.