The stage is 61 meters long. It is about one meter above the ground. To the back is the wall. Its height is the same as in Roman times. This wall is very important to the theatre. This is because it helps to make the sound louder for the large audience. The wall is also known as the scaenae frons. It is the only place with decoration in the entire theatre. It used to have marble mosaics of many different colours. It also had many columns, friezes and statues placed in niches. The central niche contains a statue of the emperor Augustus. This was likely a restoration of an original statue of Apollo, the god of music and the arts. The central door, below the central niche, is called the Royal Door, or "valva regia." Only by the most important actors used this door to enter and exit the stage. Above the door there was a frieze decorated with centaurs. It is not there anymore. It is now on display across the street in the Orange Museum. Only some parts of it are left. The stage now has a modern platform. This is to stop damage when actors use it for operas and other performances.