5. We think of the passage of NBA time in seasons, for obvious reasons. There's connection, a continuum. It's how we remember things that happen, in the course of a season of play. But there's some benefit to looking back at a calendar year, January 1 to December 31, and what we've learned in that process. After all, many say the "unofficial start" to the NBA season is Christmas, with the new year starting soon after. So here are the lessons we learned about the NBA in the year 2017.