Lost Season 6 Episode 3

Star Trek: Deep Space Nine: Dogen has a baseball placed on his desk. In the TV series DS9, Benjamin Sisko, the commander of the station, used to have a baseball prominently placed on his desk throughout the entire run of the show. In the pilot episode, he used the baseball as a metaphor to explain the nature of linear time to the inhabitants of the wormhole, who experienced time all at once.