I am not sure whether that is absolutely scientifically accurate, but there is sufficient truth in it to give us food for thought. I have a friend who also sets her vases of flowers in front of a mirror in a similar way and that certainly increases their beauty.
We are fond enough of magnifying our difficulties, of doubling our troubles. What a difference it would make to us and to those about us if we would start doing it with our blessings for a change. Let's see them double too!