Fragments of A Penrose Triangle

These appear to be reasonable fragments of 3-D objects

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These two appear to be pictures of impossible objects, yet we
see all the relationships between the parts that are locally
possible even though globally they are impossible.

This is another view showing the actual structure of the object
from a different viewpoint

Here is a video showing how to make such a thing.
(Apologies for adverts)

Stencil for paper shape to be used.