Penrose Stairs (Blender Animation and Explained)

The Penrose stairs or Penrose steps, also dubbed the impossible staircase, is an impossible object created by Oscar Reutersvärd in 1937 and later independently made popular by Lionel Penrose and his son Roger Penrose.
It is impossible to achieve in three-dimensional Euclidean geometry.
But Blender animation and some clear perspective made is into a convincing video.
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[TheRojo]

This is a close relative, I realise, of the impossible tribar.