Indeed, Post-it notes are one of the simplest products out there. They are literally just a square of colored paper with a strip of adhesive at the top. That being said, the simplicity is the very feature that enables Post-its’ versatility. Their function alone allows you to mark off pages in books–and the variety of color options allows for thematic organization that was previously unthinkable. Without Post-its, people had to actually flip through each page of a book in order to see what they had considered important. Not only are Post-its an analytical time-saver, however, they are also incredibly useful in other contexts as well. My personal favorite usage of Post-its is as a reminder mechanism. Their unimposing size, combined with their noticeable vibrancy allow for unobtrusive, yet reliably recognizable calls to action. That is why, when I really need to remember something, I will leave a Post-it on my door so I physically cannot forget. These are just two of the many features of Post-it notes. Their continued success speak volumes about how even the simplest of inventions can have such a wide range of continued usages.