| Summary: | Historically, a great deal of attention has been addressed to the question of what it would take to test experimentally the metrical structure
of spacetime. Arguably, however, consideration of this question has been
at the expense of comparable investigations into what it would take to
test other structural features of spacetime. In this article, we critique and
expand substantially upon an article by Hadley [26], which constitutes
one of the best-known paper-length studies of what it would take to test
the orientability of spacetime. In so doing, we seek to clarify a number
of matters which remain unclear in the wake of Hadley’s article, thereby
allowing the literature on this topic to progress. More positively, we also
present, compare, and evaluate a number of other potential approaches
to testing the orientability of spacetime which have arisen in the recent
physics literature.
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