First Generation Impossible Objects

"Anomalous Objects" That Realise Pictures of Impossible Objects

There is a class of pictures called "pictures of impossible objects". They are considered possible only in a picture. However, I found some of them can be constructed as 3D objects.

Those 3D objects give us an impression that they are impossible although they are actually in front of us.

Endless Loop of Stairs

This is a building with a rectangular yard. At the top of the building are constructed stairs. However, if we follow the stairs, we come back to the start point.
The next image is a view of the same object seen in a different angle.
This object can be constructed by papercrafing from the pictures of unfolded surfaces

Other Anomalous Objects

References Machine Interpretation of Line Drawings

To Kokichi Sugihara's English Top Page