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The End of Time
I have to say that I think that there are problems with Barbour's ideas though. Firstly relativity says that there are many ways of matching 'now' here with 'now' elsewhere. Barbour includes all such ways as part of Platonia, which I feel is excessively bloated as a result - mathematical fictions have been substituted for reality. The second problem is the deciding what exactly an instant is - do we have to accept uncountably many instants in the smallest interval. I find any philosophy which requires a particular structure for time at the lowest level to suspect. However, I wouldn't say that these were criticisms of the book, rather an indication of how Barbour's ideas can stimulate discussion.