Photographs are things that can be brought to life, over and over again, any number of times, depending on their environment. Put it in another way: The only way you can ensure that a shot will ever be at all meaningful is if you take it. Don't think too hard about it beforehand, don't be too self-conscious or rational - just press the shutter button. There'll be all the time in the world for other people to come along later and attach whatever implications or "meaning" they like to it.