In the dialogue 'Time and Time Again' {Philosophy, April 1973), T. E. Wilkerson endeavours to convince a sceptical acquaintance that there could exist a second temporal dimension. One would expect that Wilkerson would have produced a model to support his case, i.e. we should expect to hear about a set of conceivable circumstances which would justify the belief in a second temporal dimension. To the contrary, all that we are given is a spatial representation consisting of a horizontal axis t&, and a vertical axis t-&: On the horizontal axis, we measure the temporal dimension that you are acquainted with-1&. I'm trying to convince you that there is (or at the least there could be) a second temporal dimension, t-&, which is at temporal right-angles, so to speak, to t& (p. 173).
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