We think about time in terms of space, as revealed in the way we talk about it ("looking ahead to our future"; "looking back at our past") and in the results from psychology experiments. For instance, people from countries that write right-to-left find it easier to associate future events with the right-hand side of space. This begs the question - how much space do we think time takes up, and is it always constant, or does it vary with how richly we represent particular episodes?
Christian BM, Miles LK & Macrae CN (2012). Your space or mine? Mapping self in time., PloS one, 7 (11) PMID: 23166617