https://www.youtube.com/watch?v=S_xxCewKE_0
https://nirmalyakajuri.substack.com/p/how-roger-penrose-trapped-the-singularity
https://en.wikipedia.org/wiki/Penrose_interpretation
https://en.wikipedia.org/wiki/Penrose_triangle
https://upload.wikimedia.org/wikipedia/commons/e/e7/Penrose-triangle-4color-rotation.gif
https://en.wikipedia.org/wiki/Penrose_triangle#Creation_of_the_Penrose_triangle_from_partial_figures
