Gestalt starts from an idea that is simple and hard to apply: the past shows up in the present. You don't need to reconstruct what happened at six years old, because the pattern formed then is alive right now, in the room, in the way you hold your shoulders when you talk about your mother.
Hence the emphasis on the "here and now". A Gestalt therapist will interrupt you with "what's happening in your body right now?" precisely when the story becomes fluent — because fluency is often the sign that a story has been told many times and no longer touches anything.
The German word Gestalt means whole form. The premise is that unfinished experiences — a conversation you never had, an anger you never expressed, a grief never carried to its end — stay open and consume energy until they are closed one way or another.