There are a lot of stories about Monticello that crept into the lore over the years - mostly after Jefferson died, after all the family had left Monticello, and no one who had lived there during its heyday was around anymore to refute them. These stories found their way into popular literature and are still coming back home to roost, so to speak, in the form of queries from visitors. One of the most persistent of these stories is one about Jefferson using the Dome Room as a billiard hall.
It is unclear whether Jefferson ever played billiards, but there is some documentary evidence that he did not look favorably on the game. He wrote in "Thoughts on Lotteries" in 1826, "...But there are some [games of chance] which produce nothing, and endanger the well-being of the individuals engaged in them, or of others depending on them. Such are games with cards, dice, billiards, etc."[1]