If you casually look at this picture, you will get an impression that there are puddles on the road. But, they are actually giraffes viewed from above.
When you look at this picture casually, you will think that there is nothing shown in the picture. But, it is actually a picture showing a bear descending down the tree. Its paws are only seen in the picture.
Many would say that this picture is showing a car wheel. But, it is actually a picture showing a Mexican dancer wearing a sombrero when viewed from above.
If you look at this picture, you will initially get an impression that there is half of the sausage or a heel print. But, if you think a bit more, you will also see a train coming out of the tunnel.