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===== Parable II =====

(Lecture: 10 minutes)

    * Application of surveyor's parable to spacetime
    * Use same units
    * Interval is invariant
    * Conversion is Lorentz transformation

See (ss)[[gsr>book:gsr:diagrams|5.1]] of [[gsr>|the text]]. 

==== Reflections ====

This is the second of two short lectures based on the surveyor's parable.  The
[[.:rflecparable1|first lecture]] introduced the parable in its Euclidean
setting, where its consequences are rather obvious.  This lecture discusses
the implications for special relativity, setting the stage for the use of
spacetime diagrams.

Both lectures can be given the same day, although it is quite effective to end
one day with the first lecture, ask students to reflect on it, then begin the
next class with an interactive version of the second lecture.

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