In Guillotine, the rules state that the cards should be "face up". But is it ok to stack the nobles on top of each other into piles? Technically, they are still face up, but the points are not visible. Or perhaps the point value should be visible at all times as to avoid confusion? 

I guess the real question is, should other players be able to "count" your points at all times, or is it ok to make it harder for them to do so?