What was the function of an atrium in a villa?

In contour drawings crossing lines is one way to indicate this

Although many musicians participated in the bebop revolution, and history has undoubtedly forgotten many who were in the trenches of the harlem jam sessions, it is clear that the most important and influential architects of bebop were and

Atypical scale usually consists of one of pitches. 1. rhythm 2. octave 3. key 4. series