the secret object is not drawn as an obvious standalone figure. Instead, parts of surrounding objects combine to create its outline.
A tree branch might become part of an animal’s face.
An empty patch of background might suddenly resemble a body.
Two unrelated lines may form ears, legs or a snout when viewed together.
This technique relies heavily on what artists call negative space — the apparently empty areas surrounding the main subjects.
Your brain normally treats those spaces as background and largely ignores them.
But the moment you begin examining
