Kumar said:
Pls don't mention placebo, faith etc. effects.
Kumar said:
I think it is not scientific but is somewhat psyclogical/placebo.
Ok, now that we have the rules down;
Our minds have a strong affinity for symbols. A photograph is a very strong symbol. We use photographs, like other symbols, as a proxy for the real thing, because it's easier to carry around.
A candle flame is also a symbol. To some people, it conjures up abstract concepts such as "life".
We put a candle in front of a picture of a dead person because we enjoy the effect that this conjunction of symbols has on our minds. By means of the symbol-thing relationship, it fools our minds into imagining the person to be alive; an enjoyable state called "fondly remembering."
To some people, I suppose, it also suggests a parallel future scenario in which they are the person in the photo, and their descendants are lighting candles and fondly remembering. This idea can help take the edge off that uneasy human state called "fear of death".
To some people, the symbolic relationship is so strong, that they get confused, and imagine the symbol to be the thing it represents. In the end, a photograph is gelatin with silver salts in it, a candle is a slowly oxidizing stick of hydrocarbon, and the two together have no effect outside our minds.