An end-user system (10) for transforming real-time streams of content into an output presentation includes a user interface (30) that allows a user to interact with the streams. The user interface (30) includes sensors (32a-f) that monitor an interaction area (36) to detect movements and/or sounds made by a user. The sensors (32a-f) are distributed among the interaction area (36) such that the user interface (30) can determine a three-dimensional location within the interaction area (36) where the detected movement or sound occurred. Different streams of content can be activated in a presentation based on the type of movement or sound detected, as well as the determined location. The present invention allows a user to interact with and adapt the output presentation according to his/her own preferences, instead of merely being a spectator.