A method performed by a user interface system (2) is disclosed for adapting a graphic visualization (13) of a virtual element (14) on a display (3) to render a corresponding fictitious physical element. The user interface system determines surrounding light characteristics (401) of surrounding light associated with the display, and determines light adjusted characteristics (403) of the virtual element based on the surrounding light characteristics. The user interface system adapts the graphic visualization based on the light adjusted characteristics, such that the graphic visualization resembles the fictitious physical element (405) should the fictitious physical element have been subjected to the surrounding light. The invention also relates to the above user interface system, and includes a transport (1) of the above user interface system. By considering surrounding light conditions prior to adapting the graphic visualization, the graphic visualization may change appearance depending on surrounding light conditions. The rendering may accordingly change dynamically when the surrounding light conditions change, similar to the appearance of true physical elements, thus providing a more realistic appearance of the graphic visualization.