Thanks for the reply. I think you might misunderstand my point. I have no intention of proposing a change to the user interface(e.g. notebook or note color). I was just thinking of another way of categorising notes to ease search so people don't have to remember Beatles tag to a British band or beetle to an insect as years later they may forget particular tags linking with what kind of notes anyway. They merely remember a funky note by its code 'pink'. Well, I express color my personally way. Green no longer stands for Lybia nor green party, it's environmentalism or healthy food. I guess you guys watched a movie 'A few good man' last century? 'Code Red' is a common type of military orders to rough up an uncooperative soldier. I even suspect it is necessary to be 'color code' but still a natural way to group, isn't it? Just a concept.