When I bought this at IKEA I only knew I wanted my pens to be better organized above my desk. Then I was cleaning in preparation for hanging the rail up and decided I should use one of the cups for all my bookmarks. No excuses for not knowing where one is now! I also learned I hate power tools and if I have a daughter I will find someone to teach her to use them...talk about frustration with your own lack of abilities 😝.