At a glance it looks like what you perceived it. But on a second and more deeper observation, you begin to spot something totally different. And when all is settled, it becomes clear that there is more to it than what meets the eye (at first sight).
This is the magic of negative space illustration. An art term for something like this:
Negative space is the space around and between the subject(s) of an image. Negative space may be most evident when the space around a subject, not the subject itself, forms an interesting or artistically relevant shape, and such space occasionally is used to artistic effect as the “real” subject of an image (Wikipedia)