That tree has wandered all his life seeking out new sights, new experiences, new ways to combat its unending boredom. It does not know why the great glow gave it the ability to form higher cognitive reasoning, neither does it care. It has flitted from land to land observing the vastness of Meriga and its people. Some times it has planted itself someplace nice and listened to the people as they teach their sciences, some times it has floated for years without civilized contact.
It remembers when it was quite small, it was easy to sneak in and study, now it is too large to easily hide among a potted plants and outside shrubs. Now it is finally ready to take the next float and interact with these "people", to become part of their society... and where better but a dingy bar in the biggest city in the world.