These illustrations are designed as real visual puzzles. At first glance, you can often make out a human face, but then, on closer inspection, several animals appear, subtly intertwined with each other. The idea is simple: our brain instinctively spots a shape before the others, and this first perception is supposed to reflect a dominant trait of our personality.
The success of these images is based on their immediacy. No need for long questions or deep thought: all it takes is one look, and the verdict is in. It's fast, fun and perfectly adapted to our express consumption of social networks.