There are artists with sufficient visual and spatial cognitive abilities that can do exactly what you claim cannot be done—to imagine and sketch out new anatomies on the fly.
The mind projection fallacy is confusing properties of your thoughts with the environment, in this case it would be to think that because your imagination of something was imperfect then it really was fuzzy in the real world. Confusing the way you think with the way others think is called the typical mind fallacy.
Mind Projection Fallacy.
There are artists with sufficient visual and spatial cognitive abilities that can do exactly what you claim cannot be done—to imagine and sketch out new anatomies on the fly.
The mind projection fallacy is confusing properties of your thoughts with the environment, in this case it would be to think that because your imagination of something was imperfect then it really was fuzzy in the real world. Confusing the way you think with the way others think is called the typical mind fallacy.
Oops.
Agreed—I was thinking of that in the third paragraph; when it is possible, it’s still pretty slow—faster than drawing, slower than rendering.
(Without requiring amazing artists, I think a lot of people would be capable of imagining their bedroom at a high level of detail.)