I am making my giur and got a book from my teacher with all kinds of questions. In the chapter about lighting the candles I found one I am not able to answer:
It is reported about the Gaon of Vilna that he used to kindle many lights in honour of Shabbat. Give two explanations for his extraordinary custom.
I guess that the straight answer that he enjoys seeing the lights and that this seeing strengthened his feelings about the holiness of shabbat will not suffice as a correct answer. I also do not see (as far as my little knowledge tells me) any halachic obstructions and may be he had a lot of children although I guess that lightning a candle for each child is a rather modern habit?
So are there better reasons?