An actor is concerned with two forms of transformation:
Character - a transformation of identity.
Style - a transformation of reality into the presentational culture of a production.
There are many ways to transform reality. Some random examples:
Transformation is where the real fun lies! This is where the stage actor reasserts her role as an artist, where she becomes more than an obedient figure sharing secrets, trapped inside the frame of the camera.
Sometimes in the Arts an act of transformation is provoked by the limitations of the medium. A necessary evil becomes a blessing. A very simple example would be early photography. With no colour film yet invented, the world was transformed into black and white. But this transformation revealed secrets of light, form and drama that were so compelling that even today black and white is often the preferred choice. Immediately it conveys a sense of style.