I am still troubled by the "twin" paradox (thanks to those who have answered my previous question and suggested some reading which I will follow up). I have however thought of a variation on the experiment though - what if there are five clocks?
Clock 1 is of an observer.
Clocks 2 and 3 are travelling away from clock 1 at let's say 0.5 c in opposite directions.
After one year (say from clock 1's perspective) they each encounter a clock (clock 4 and clock 5) travelling towards clock 1 at 0.5 c (from clock one's perspective) and clock 4 and clock 5 synchronise their times to clock 2 and 3 respectively.
One year on the clocks 4 and 5 are passing clock 1, and each other. What do each of the clocks show as the time ? In a sense clock 1 is not needed for this thought experiment but is still interesting to have it in the mix. But the basic issue is, will clocks 4 and 5 "see", each of them, the other clock as having run more slowly?