I recently had an argument about why time is relative. My friend found it hard to conceive how time could not be absolute. At that time, when I tried to explain it, I found that it was hard for me see WHY time really is relative. All I could do was state experimental results that indicate it is the case. This shows that thinking you can understand a deep concept at a very shallow, philosophical level doesn't really mean much, but at least it's better than no understanding at all.
This is a companion discussion topic for the original entry at https://vault83.com/threads/time-is-relative.16/