The answer is the horizon line.
Saxophones produce sound by using the player's flow of air and creating an oscillating motion with the reed acting as an oscillating valve.<span> The reed and the resonances that are present within the air inside of the instrument produces a vibrating and radiating sound out of the holes as well as the belly of the instrument.</span>
They help the actor eliminate stage fright and help in preparedness.
The answer is <span>Fauvism</span>