That depends on a lot of things: the question, the image on the card (at least the way I read) and most importantly what your intuition tells you it means on that particular occasion.
The way I see it, it can be either positive or negative or anything in between at any given time. I don't think its posible to say in advance that it will always be positive or always be negative. You have to feel which it is in the spur of the moment. There are very few absolutes in Tarot, to me.
Although science stops at the borders of logic, nature does not. It blossoms even where no theories have as yet penetrated.
Love this world with the joy of a child, because anything else is only make believe