People say that we are all time travellers because we move through time at a rate of 1 second / second.
I pointed out in my definition on what is time travel that this is not the case…if time is like a river and we sit on a boat floating on that river, we have an analogous case – we flow down-stream but we’re not in control. We drift; we don’t travel (except relative to the river bed).
A friend pointed out that maybe describing time as a river isn’t strictly correct. According to the general theory of relativity (GR) time is relative and should be viewed on a local scale, whereas the picture of a flowing river is holistic (and therefore not covered by GR).
However, the counter argument is that the river of time can be viewed – or indeed changed – on a local scale. A sand bank, or a large fish can locally affect the flow of water.
And as a colleague pointed out – as in GR, a moving fish can eat a smaller fish and gain mass.
“It makes sense” he added. “When I’ve eaten a large lunch my perception of time definitely changes.”
I don’t think much more can be said on that subject!