michel123456 Posted August 5, 2020 Share Posted August 5, 2020 (edited) Maybe the most interesting thread of this Forum so far. It looks like the philosophy section is the most civil of all. Here we can disagree & continue the discussion, very nice. 4 hours ago, Markus Hanke said: Fair enough, but I'd put it the other way around - 'to vary' inevitably implies a process (and thus time) to me, whereas 'change' does not. But that's just convention But you were using the concept of "variable" (was that you or Studiot?). Sure the concept of fractal is an interesting way to overcome the question of the original dimensioning in a universe where everything is relative. The trouble with fractals is that AFAIK from the extremely small till the extremely big there is no repetition. But that is very far out of topic. 17 hours ago, MigL said: He certainly can't place the mirror... But if he were to look at a pre-existing mirror 20 light years away, he could ( with suitable technology ), see himself graduating 40 years ago. Imagine this mirror being installed 30 years ago (as observed by us) 20 LY away. When graduating, the mirror wasn't installed yet. So Joigus 40 years ago couldn't observe the mirror. The rays of lights expelled by graduating Joigus's happy face (his image) are travelling through space towards the mirror & reach it after 20 years of travel. They are eventually reflected to us & reach him today so that he can see his own image as he was in the past. In the same time interval, Joigus has traveled in time: he has aged. Now: where is Joigus? Is he today with us? Or is he 40 years ago? (sorry) Or was he 40 years ago? Or both? Are there 2 Joigusses one today & one 40 years ago? The conventional answer is that Joigus exists today & Joigus existed 40 years ago: it means that Joigus is a 4D object that extends in spacetime from his birth, his graduation until today. My (unconventional) answer is that there exist only one 3D Joigus that have changed location (he has moved) in time (he has aged) and the image in the mirror is, well, an image. It is a completely different concept but AFAIK it is compatible with the existing physics. Edited August 5, 2020 by michel123456 Link to comment Share on other sites More sharing options...
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