After staring at the picture for several minutes, I tried something different. I moved farther away from the screen and looked at the entire illustration instead of concentrating on individual details. Surprisingly, some of the confusing lines became easier to understand. I also tilted my head slightly and examined the branches from another angle.
This technique made me realize how easily our eyes can overlook familiar shapes when they are surrounded by distracting details. The puzzle wasn’t necessarily difficult because the pig was invisible. It was difficult because my brain kept telling me I was looking at ordinary scenery.
