*2.2.2 Acoustics in the Greek and Roman eras*

By the Greek and Roman eras, the communities' fascination was the philosophy and the poetry. They build the amphitheaters, where speech and music could act, to communicate their knowledge. The shape of these buildings was to enhance the sound dissemination within the space (**Figure 3**). They used the open air to add extra reinforcement to the sound projection. At the same time, the open air works as a reflection to amplify their speech sound, in addition to the "horseshoe" plan layout and the level in the amphitheater style of interior layout, which enhances the acoustic performance of the place [4]. The steps of the audience area act as amplifier additionally to the rule of "Seeing ensures Hearing." As much, the person sees the stage as much the sound reaches the person without obstacles, although it

**Figure 2.** *Hunting scenes in the prehistorical era, in tents and open air [2].*

#### **Figure 3.**

*The amphitheater (the Greek Odeon of Herodes Atticus in Greece on the right and the Roman Theater of Mérida in Spain on the left) [3].*

needs some reinforcements. The high edifice was using the background of the stage performance as backstage services spaces, stage set design, and main reflection elements to strengthen the sound on the stage.
