I've noticed in some old filmings that the image had a kind of 3D effect. They where low rezolution images (including one filme with an '000's portable amateur videocamera). Example (both black and white and color):
https://www.youtube.com/watch?v=f-5B9cM2XyI
Here you can notice a little bit too:
https://www.youtube.com/watch?v=KF_9wRVnazQ
But I've noticed in some old H.D. images too:
https://www.youtube.com/watch?v=b0yIDZz6OnA
I wonder what generated this effects?