The two dimensional representations of 3d drawings, the kind computers make these days, are so amazing for a different reason: they are precisely shaped, with realistic lighting, reflection, perspective and texture that convince the eye. For these qualities they seem at first glance as convincible and as real and three-dimensional as a real photograph
But, beginners who are learning computer graphics often like to take a challenge where they paint in a 3d drawing into a real photograph, say, ...