@burcinc-- Yea, that's true. There have been a few times where I came out of a film having no idea what the various images and symbols meant. It's mistake to use symbols assuming that the viewer can see inside one's head. If symbols are to be used, it's a good idea to use basic or easy to grasp ones that everyone is familiar with.
I watched a great film recently, an adaptation of Hamlet. But the film was set in 1990s Kashmir. Some of the promotional posters an imagery involved a drop of red paint on a white background. The image immediately made me think of blood and that was the whole point. It symbolized the bloodshed that occurred in Kashmir in those circumstances. That's the kind of symbolism I'm talking about.