After working in retail for over 10 years (while I was also an unemployed actress) I still "face up" my bank notes in my purse... I also keep them in order from the lowest denomination in front to the highest in the back... there's usually little difference between them, however, as I rarely have any "big notes" in my purse! British ones are easiest to face up, as we have HM Queen Elizabeth II on one side of each note! (above photo: British bank notes)
above: Euro bank notes... the highest denomination I have ever held is a 50 Euro note.