If the sides were around the body they should show the sides in image and extended to twice the size, shouldn’t they?
That also is a clue to how the image got formed. There are many possible ways to project a 3-D body onto a 2-D surface. This is akin to having several ways the earth can be represented on a 2-D map. Here’s a sampling:
And there are many more methods to create a 2-D map.