I came across a short article about a person who demonstrated how round objects can appear flat. In his case, he used a basketball and a camera with a good macro lens. The results showed that a very round object can appear quite flat when magnified many times, even though the object is very clearly spherical. The photographer, Jeff, said this:
“Looking at my photos, it’s easy to imagine being an incredibly small creature living on the surface of the basketball. From the perspective of that tiny creature, the ‘horizon’ of the basketball would always look ‘flat’.”
There’s nothing more that needs to be added to this. I think the evidence for the conclusions speaks for itself. You can read the article here.
Oh, and one more thing: