We face the final stretch of the course. Nerves and long study days arrive to pass the subjects. Everyone has their own system to overcome it: what if you diagram, what if memorize … Be that as it may, always accompanied by an arsenal of material. Pens, pencils, markers … and post-its. Of all sizes and colors. In May and June in libraries the tables bloom and turn into a rainbow of yellows, greens, pinks, blues … These little self-adhesive pieces of paper are essential for many people. Not just students. .