Final answer:
Inside the Arena Chapel, frescoes are used to depict religious stories and icons, while color is used to enhance storytelling and create a sense of realism.
Step-by-step explanation:
The use of frescoes inside the Arena Chapel is mainly to depict religious stories and icons. The frescoes in the chapel tell the story of Mary and Christ, with the Annunciation painted by Giotto near the altar and the Last Judgment painted on the entrance wall. The frescoes serve as a visual representation of the Christian religion for the largely illiterate European population of the 14th century.
Color is used in the frescoes to enhance the storytelling and create a sense of realism. Earth pigments that are chemically stable and do not discolor over time were commonly used. Color choices were carefully made to capture the desired mood and symbolism of the depicted scenes. For example, bright and vibrant colors may be used to represent heavenly or joyful moments, while muted tones may be used for more somber or dramatic scenes.