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I was just reading John Denker's lovely spacetime intro,http://www.av8n.com/physics/spacetime-welcome.htm,
I have never seen in 8th grade or earlier any plot of x vs t which
looked like Figure 4
(http://www.av8n.com/physics/spacetime-welcome.htm#fig-ruler-cart-t-const-x-red-transp).
It is this non-orthogonal axis plotting which is the tough part for
students, not the fact that we are plotting x vs t.