This drawing initially presents an older man's face. Its second subject becomes visible when the arrangement is viewed differently, giving the same marks another job.
Some reposts claimed that only one percent of people could find the animal within two minutes, but no supporting test or population sample was supplied. Treat that number as an unsupported promotional claim.
The puzzle is to find the animal formed by those shared lines.
Before we reveal the answer that will show you which animal hides in the image, we will give you a hint.
Notice what seems to be growing on the right side of the old man's head. That will give you a clue on how to approach this picture, without suggesting that solving this drawing puts you in a measured population percentile.
The answer appears below, with the altered orientation making the second subject clearer.
The hidden animal is a dog. Turning the image changes which lines the eye groups together, allowing the new outline to emerge.
Now while looking at the picture above, can you see the old man again?
After finding the dog, the original face may still be recognizable. Moving between those readings is part of the puzzle's appeal.
Reference: Shared
The same lines belong to another outline
The drawing does not add new information when it is turned; it changes the organization of information already present. A mark that belonged to one feature becomes part of another outline. That economy makes a reversible image satisfying, because the solution reveals a second coherent arrangement rather than an arbitrary hidden detail. The promotional claim about only one percent of viewers remains unsupported, and solving speed should not be used to rank a reader's abilities.
COMMENTS