Sisko loves baseball, a sport that has largely disappeared by the 24th century but is kept alive by a small group of aficionados. He keeps a baseball on the desk in his office (given to him by an alien impersonating Buck Bokai, Sisko's favorite historical baseball player, halfway through the first season), and often picks it up and tosses it around when deep in thought. When the Dominion captures DS9, Sisko leaves the ball in his office as a message that he intends to return (this can also be seen in the second season three-parter, consisting of "Homecoming," "The Circle" and "The Siege" and also the Season 5 finale, ""). After Jadzia Dax's death in the Season 6 finale, "Tears of the Prophets", he takes the baseball with him to Earth, causing Kira Nerys to worry that he will not return.