Sisko finds that he has encountered entities in the wormhole who speak to him through images of his wife, friends, and crew members. The "wormhole entities" question Sisko's corporeal and linear existence, and explain that they become disrupted when such beings pass through the wormhole.
Sisko attempts to explain how his kind thrive on its linear existence, but the entities point out that he continues to return to the moment of his wife Jennifer's death. "You are here!" Sisko comes to the rationalization that he has been grieving over the loss of his wife and explains this to the aliens.
The wormhole entities could be any kind of entity one might encounter OBE through the stargate of 8th Circuit Neuroatomic consciousness. As the modus operandi of these wormhole entities is very reminiscent of certain altered states of the entheogenic kind; "What comes before now, is no different than what is now, or what is to come, it's one's existence."
Dax meditating, an exercise where you have to maintain the shape of some kind of energy ball. (1x04 A man alone).
Interesting architecture on the Cardassian space station. (The Nagus 1x11)
For CK and Jake, a
From the episode "If Wishes Were Horses" wherein an alien species tries to learn more about humanoid imagination by making it manifest in reality.