What does "Monday" mean to you? It probably elicits a feeling quite different than the idea of "Friday" or "Wednesday" or really, any other day of the week. While most of the tools and methods we use to measure 'time' are logical, based on the movements of the earth and moon around the sun, the days of the week, all seven of them, are totally arbitrary. Sure, they've been around for thousands of years, popularized by the Romans, but their essence, their meaning, has been entirely constructed by people. So whether it's a Monday or a Friday, a Tuesday or a Sunday, don't forget that it's just a day, a unique and singular opportunity to exist, right now.