Difference between revisions of "20: Sir Roger Penrose - Plotting the Twist of Einstein’s Legacy"

20: Sir Roger Penrose - Plotting the Twist of Einstein’s Legacy (view source)

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 There’s also this diagram, which I found at a blog here: http://arkadiusz-jadczyk.eu/blog/tag/penrose/
-[[File:image_6.png|thumb|none|alt=image alt text|image alt text]]
+[[File:Penrose-Rindler-Clifford-parallels.jpg|thumb|none|alt=Penrose-Rindler-Clifford-parallels|Penrose-Rindler-Clifford parallels]]
 And there’s this diagram, which I found at this link ( http://users.ox.ac.uk/~tweb/00001/ ) which is an HTML presentation of “On the Origins of Twistor Theory” - Roger Penrose, 1987
-[[File:image_7.png|thumb|none|alt=image alt text|image alt text]]
+[[File:Robinson.jpg|thumb|none|alt= A time-slice (t=0) of a Robinson congruence.| A time-slice (t=0) of a Robinson congruence.]]
 [NOTE: these latter two might be Versions 1 and 2? Or later reproductions.]