That’s why you can sometimes stare directly at a hidden figure without realizing what you’re seeing.
The problem isn’t necessarily that the object is too small. In many cases, it is the way the surrounding shapes are arranged that makes the figure difficult to recognize.
Have You Looked at the Whole Image?
If you’re still searching, try changing your approach.
Instead of examining one tiny section for a long time, look at the entire illustration from a short distance. Allow your eyes to take in the overall composition rather than concentrating on individual details.
Then slowly scan across the image.
Pay particular attention to unusual curves and shapes that don’t seem to belong naturally to the objects around them. A branch may have a shape that looks slightly different from the others. A space between two objects may have an interesting outline. A collection of several small shapes may begin to resemble part of an animal.
The goal is not to force yourself to see a pig everywhere. Instead, you’re looking for an arrangement of shapes that makes sense when viewed from another perspective.